Broken support for PICO UART BRIDGE (ESPTOOL-1134)

[therealdreg]

Operating System

Windows 11

Esptool Version

esptool v5.0.2

Python Version

esptool.exe

Chip Description

ESP-C2

Device Description

Something broke in the new versions of esptool.exe. I’m using an RP2040 as a UART BRIDGE and it has always worked fine (I do this to save a USB connector, so I can program both the RP2040 and the ESP through the same USB port). But in the latest versions it doesn’t work — it can’t program the chip. I’ve tried several baud rates and it still doesn’t work.

I’m attaching the --trace output from the esptool version that works and the --trace from the latest esptool.exe version that doesn’t.

trace-good-esptool-old.txt

trace-bad-esptool-last.txt

https://github.com/therealdreg/okhi?tab=readme-ov-file#schematic

Hardware Configuration

https://github.com/therealdreg/okhi?tab=readme-ov-file#schematic

https://github.com/therealdreg/okhi/tree/main/stuff/pico-uart-bridge-dregmod

https://github.com/therealdreg/okhi/blob/main/stuff/pico-uart-bridge-dregmod/uart-bridge.c

How is Esptool Run

NO IDE, WINDOWS CMD

Full Esptool Command Line that Was Run

esptool.exe --trace --port COM23 --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

Esptool Output

Warning: Deprecated: Option '--flash_mode' is deprecated. Use '--flash-mode' instead.
Warning: Deprecated: Option '--flash_freq' is deprecated. Use '--flash-freq' instead.
Warning: Deprecated: Option '--flash_size' is deprecated. Use '--flash-size' instead.
Warning: Deprecated: Choice 'no_reset' for option '--before' is deprecated. Use 'no-reset' instead.
Warning: Deprecated: Choice 'no_reset' for option '--after' is deprecated. Use 'no-reset' instead.
Warning: Deprecated: Command 'write_flash' is deprecated. Use 'write-flash' instead.
esptool v5.0.2
Serial port COM23:
Note: Pre-connection option "no-reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting...
  TRACE +0.000   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.111   No serial data received.
.
  TRACE +0.057   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.106   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.110   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.110   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.107   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.110   No serial data received.
.
  TRACE +0.054   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.108   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.107   No serial data received.
.
  TRACE +0.055   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.112   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.110   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.108   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.110   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.107   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
  TRACE +0.109   No serial data received.
.
  TRACE +0.053   --- Cmd SYNC (0x08) | data_len 36 | wait_response 1 | timeout 0.100 | data 
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU ---
  TRACE +0.000   Write 46 bytes:       
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.

More Information

No response

Other Steps to Reproduce

trace-good-esptool-old.txt
trace-bad-esptool-last.txt

I Have Read the Troubleshooting Guide

• I confirm I have read the troubleshooting guide.

[github-actions]

Hi @therealdreg! Please be aware that (1) the following suggestions are generated by a bot and haven't been fact-checked by Espressif Systems, (2) burning eFuses and enabling security features are irreversible operations and can damage your ESP32 device. We hope that this message will help you until an Espressif Engineer looks at your issue.

---

Thanks for the detailed report and for sharing the esptool traces.

From the trace you posted with the new esptool.exe, the tool is repeatedly sending the SYNC command but receives nothing back (“No serial data received”). This pattern indicates the RX/TX path to the ESP32‑C2 ROM bootloader is not getting any data back to the host. The common causes and checks are:

• Verify the serial wiring of the bridge: ESP TX → host RX, ESP RX → host TX, and common GND. Only 3.3 V UART levels are supported (no 5 V/RS‑232) (Serial Connection).
• Ensure the ESP32‑C2 is actually in download (ROM bootloader) mode when you run esptool (you’re using --before/--after no-reset, so esptool won’t toggle lines for you). Manually enter download mode: hold BOOT (GPIO9) low and reset EN, or otherwise pull GPIO9 low during reset as per your board design (Flashing Troubleshooting).
• “No serial data received” typically points to hardware/connection or boot-mode issues, including the TX path from the ESP back to the host being blocked. Double‑check the bridge firmware and any line inversions/flow control, use a known‑good USB cable, and try a lower baud rate to rule out signal integrity issues (Common Errors).
• Use esptool --trace while in ROM download mode to confirm whether any SLIP packet is ever received. If nothing is received, focus on the bridge UART and boot-mode signals (Tracing esptool).

Given your command uses “no-reset” and a custom RP2040 UART bridge, the next actionable checks are:

• Manually force download mode before running the command (BOOT low + reset EN), then run your exact esptool command. If it still shows “No serial data received,” try 115200 baud and 460800 baud. (Common Errors).
• Confirm the bridge does not assert any flow control and passes bytes transparently at the selected baud rate; mismatched baud or added buffering/latency can prevent the SYNC reply within the 100 ms window shown in your trace.
• If possible, temporarily bypass the RP2040 bridge with a standard USB‑to‑UART adapter to confirm the ESP32‑C2 responds in download mode. This isolates whether the change in behavior is in the bridge path.

If the above does not resolve it, please attach a short --trace capture taken while you manually hold the chip in download mode and test at 115200 baud, so we can see if any SLIP packet appears. The esptool troubleshooting flow treats persistent “No serial data received” as a hardware/connection/boot‑mode issue to resolve first (ESP32‑C2 Troubleshooting, General tips).

[Dzarda7]

Hello @therealdreg, I am not really aware of some changes in communication process. Can you analyze what is received (in usb_read_bytes) by rpi and what is sent (by usb_write_bytes)? Also if the ESP is put in download mode correctly?

Just FYI there is esp-serial-flasher project, which can be used to flash the ESP from any MCU with custom port, what's more RPI pico port is already present and you can implement it into your project without reflashing the RPI everytime you update the firmware, you just need to figure out a way to get binary on the RPI pico, for example MSC class can be used. UF2 format can be also used, which is used in esp-usb-bridge which you can take as inspiration.

[therealdreg]

Thanks for replying so quickl @Dzarda7 With the esptool 4* that I use, everything always works the first time without issues. The error seems to come from some change in esptool… It’s something that only gets flashed once and never connects to a PC 😆. As soon as I have a moment, I’ll send you what you asked for. Do you need me to run any other tests? I’d really like to be able to use the latest version…

[Dzarda7]

If you want to find what commit caused your issue, you can install esptool master branch in editable mode and try to use git bisect to find the commit that caused this.

[therealdreg]

@Dzarda7

v4.7.0 <--- works fine
v4.8.dev1 <-- works fine
v4.8.dev2 <-- NO WORKS

v4.8.dev1 <--- works fine

git switch --detach v4.8.dev1

Previous HEAD position was 162238c ci: Remove the deploy_docs_production job from the scheduled pipeline
HEAD is now at d9a6660 feat(esp32c5): add target esp32c5 beta3

python esptool.py --port "COM23" --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting....
Chip is ESP32-C2 (revision v1.2)
Features: WiFi, BLE
Crystal is 26MHz
MAC: 78:ee:4c:6c:35:2c
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
Flash will be erased from 0x00000000 to 0x00004fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x00010000 to 0x000c9fff...
Flash will be erased from 0x00300000 to 0x003fffff..
...

v4.8.dev2 <--- NO WORKS

git switch --detach v4.8.dev2

Previous HEAD position was d9a6660 feat(esp32c5): add target esp32c5 beta3
HEAD is now at 162238c ci: Remove the deploy_docs_production job from the scheduled pipeline

python esptool.py --port "COM23" --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting........................

python esptool.py --trace --port "COM23" --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting...TRACE +0.000 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.107 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.107 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.107 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.110 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.109 No serial data received.
.TRACE +0.054 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.108 No serial data received.
.TRACE +0.053 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes:
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.

v4.7.0 <--- works fine

git switch --detach v4.7.0

Previous HEAD position was 162238c ci: Remove the deploy_docs_production job from the scheduled pipeline
HEAD is now at bff9334 change: Update version to 4.7.0

python esptool.py --trace --port "COM23" --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting...TRACE +0.000 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes: 
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.103 No serial data received.
.TRACE +0.055 command op=0x08 data len=36 wait_response=1 timeout=0.100 data=
    0707122055555555 5555555555555555 | ... UUUUUUUUUUUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    55555555                          | UUUU
TRACE +0.000 Write 46 bytes: 
    c000082400000000 0007071220555555 | ...$........ UUU
    5555555555555555 5555555555555555 | UUUUUUUUUUUUUUUU
    5555555555555555 5555555555c0     | UUUUUUUUUUUUU.
TRACE +0.005 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 08
TRACE +0.000 Read 2 bytes: 0400
TRACE +0.000 Read 1 bytes: 07
TRACE +0.000 Read 1 bytes: 07
TRACE +0.000 Read 1 bytes: 12
TRACE +0.000 Read 1 bytes: 20
TRACE +0.001 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010804000707122000000000
TRACE +0.004 Read 50 bytes: 
    c001080400070712 2000000000c0c001 | ........ .......
    0804000707122000 000000c0c0010804 | ...... .........
    0007071220000000 00c0c00108040007 | .... ...........
    0712                              | ..
TRACE +0.000 Received full packet: 010804000707122000000000
TRACE +0.004 Received full packet: 010804000707122000000000
TRACE +0.003 Received full packet: 010804000707122000000000
TRACE +0.003 Read 48 bytes: 
    2000000000c0c001 0804000707122000 |  ............. .
    000000c0c0010804 0007071220000000 | ............ ...
    00c0c00108040007 07122000000000c0 | .......... .....
TRACE +0.000 Received full packet: 010804000707122000000000
TRACE +0.002 Received full packet: 010804000707122000000000
TRACE +0.003 Received full packet: 010804000707122000000000
TRACE +0.002 Received full packet: 010804000707122000000000

TRACE +0.001 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=00100040
TRACE +0.000 Write 14 bytes: c0000a04000000000000100040c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 2 bytes: 0a04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 6f
TRACE +0.000 Read 1 bytes: a0
TRACE +0.000 Read 1 bytes: 41
TRACE +0.000 Read 1 bytes: 7c
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a04006fa0417c00000000
TRACE +0.000 command op=0x14 data len=0 wait_response=1 timeout=3.000 data=
TRACE +0.000 Write 10 bytes: c00014000000000000c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 2 bytes: 1418
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 6f
TRACE +0.000 Read 1 bytes: a0
TRACE +0.000 Read 1 bytes: 41
TRACE +0.000 Read 1 bytes: 7c
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 0c
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 
    011418006fa0417c 0000000000000000 | ....o.A|........
    000000000c000000 0100000000000000 | ................
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.016 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 2 bytes: 0a04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.016 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
Chip is ESP32-C2 (revision v1.2)
Features: WiFi, BLE
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=14000060
TRACE +0.000 Write 14 bytes: c0000a04000000000014000060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: e1
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400e100000000000000
Crystal is 26MHz
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=40880060
TRACE +0.000 Write 14 bytes: c0000a04000000000040880060c0
TRACE +0.016 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 2c
TRACE +0.000 Read 1 bytes: 35
TRACE +0.000 Read 1 bytes: 6c
TRACE +0.000 Read 1 bytes: 4c
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a04002c356c4c00000000
TRACE +0.000 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=44880060
TRACE +0.000 Write 14 bytes: c0000a04000000000044880060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 1 bytes: 04
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010a0400ee7852c200000000
MAC: 78:ee:4c:6c:35:2c
Uploading stub...
TRACE +0.000 command op=0x05 data len=16 wait_response=1 timeout=3.000 data=340d0000010000000018000000003840
TRACE +0.000 Write 26 bytes: 
    c000051000000000 00340d0000010000 | .........4......
    0000180000000038 40c0             | .......8@.
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 2 bytes: 0504
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01050400ee7852c200000000
TRACE +0.016 command op=0x07 data len=3396 wait_response=1 timeout=3.000 data=
    340d000000000000 0000000000000000 | 4...............
    0111b70700604ec6 83a987004ac83749 | .....`N.....J.7I
    ca3f26ca52c406ce 22ccb70400607d5a | .?&.R..."....`}Z
    13090900c04c1374 f43f0de0f2406244 | .....L.t.?...@bD
    23a834014249d244 b249224a05618280 | #.4.BI.D.I"J.a..
    8840832709001375 f50f82977d14e319 | .@.'...u....}...
    44ffc9bf1307000c 9441aa876318e500 | D........A..c...
    854785c623a00500 7955828005476387 | .G..#...yU...Gc.
    e6000946638dc600 7d55828042051307 | ...Fc...}U..B...
    b00d41856395e702 89479cc1f5b79306 | ..A.c....G......
    c00d6316d50098c1 1305000c82809306 | ..c.............
    d00d7d556395d700 98c11305b00d8280 | ..}Uc...........
    b775cb3f41119385 05ba06c6613f6345 | .u.?A.......a?cE
    0506b777cb3f9387 87b103a7070803d6 | ...w.?..........
    47081375f50f9306 1600c206c1822392 | G..u..........#.
    d70832972300a700 03d7470891679387 | ..2.#.....G..g..
    0704631ef70237f7 ca3f130787b1a167 | ..c...7..?.....g
    ba9703a60708b736 cb3fb777cb3f9387 | .......6.?.w.?..
    87b1938686b5631f e60023a6c70823a0 | ......c...#...#.
    d7082392070821a0 f957e306f5fcb240 | ..#...!..W.....@
    4101828023a6d708 23a0e708ddb73727 | A...#...#.....7'
    00607c4b9d8bf5ff 373700607c4b9d8b | .`|K....77.`|K..
    f5ff8280411106c6 dd37b727006023a6 | ....A....7.'.`#.
    07023707000898c3 98437dffc857b240 | ..7......C}..W.@
    1345f5ff05894101 8280411106c6d93f | .E....A...A....?
    7ddd37070040b727 006098c337270060 | }.7..@.'.`..7'.`
    1c43fdffb2404101 8280411122c437c4 | .C...@A...A.".7.
    ca3f9307c4004ac0 03a9070106c626c2 | .?....J.......&.
    630a0904453739c5 bd471304c4008144 | c...E79..G.....D
    63d627010444bd88 93b414007d37853f | c.'..D......}7.?
    1c44370680001397 c70099e037060001 | .D7.........7...
    b7f6ff00758fb726 0060d8c290c29842 | ....u..&.`.....B
    7dff414791e00547 3309e940ba972328 | }.AG...G3..@..#(
    24011cc4b2402244 9244024941018280 | $....@"D.D.IA...
    411106c61307000c 6310e5021305b00d | A.......c.......
    9700c8ffe78080e3 1305c00db2404101 | .............@A.
    1703c8ff670083e2 1307b00de318e5fe | ....g...........
    9700c8ffe78080e1 1305d00dc5b74111 | ..............A.
    22c426c206c62a84 b304b50063179400 | ".&...*.....c...
    b240224492444101 8280034504000504 | .@"D.DA....E....
    4537edb71305000c 1703c8ff670003de | E7..........g...
    757126c3cedefd74 8569fd72938484fa | uq&....t.i.r....
    9387090722c54ac1 d2dcd6daa69706c7 | ....".J.........
    1691b38427002a89 26852e849730c8ff | ....'.*.&....0..
    e780809393870907 056a8a97b38a4741 | .........j....GA
    29e405677d751304 85f993070707a297 | )..g}u..........
    33842700130585fa 93070707aa97a285 | 3.'.............
    338527009730c8ff e78080902285c145 | 3.'..0......"..E
    b93f014585621691 ba402a449a440a49 | .?.E.b...@*D.D.I
    f659665ad65a4961 8280a28963738a00 | .YfZ.ZIa....cs..
    85694e86d6854a85 9700c8ffe78040e2 | .iN...J.......@.
    1375f50f01ed4e86 d68526859730c8ff | .u....N...&..0..
    e780c08b4e993304 344159b713053006 | ....N.3.4AY...0.
    55bf7171fd724ecf 52cd56cb5ec706d7 | U.qq.rN.R.V.^...
    22d526d34ad15ac9 62c566c36ac1eede | ".&.J.Z.b.f.j...
    aa89169113050002 2e8ab28ab68b02c2 | ................
    9700c8ffe7804048 856763ec57118564 | ......@H.gc.W..d
    7d74130484fa9387 0407a29733842700 | }t..........3.'.
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    e39de7f683a5cb00 03a58b005532b9bf | ............U2..
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    03a7cb0083a54b01 03a58b003384e702 | ......K.....3...
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    09618280                          | .a..
TRACE +0.006 Write 3425 bytes: 
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    0f93061600c206c1 822392d708329723 | .........#...2.#
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    f78401453ece86de a2dca6dacad8ced6 | ...E>...........
    d2d4d6d2dad0dece e2cce6caeac8eec6 | ................
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    93870700130787ba 63e0e714a5399145 | ........c....9.E
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    c8ffe780a01ab747 0060885f8145b779 | .......G.`._.E.y
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    c0                                | .
TRACE +0.319 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 5 bytes: 070400ee78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01070400ee7852c200000000
TRACE +0.000 command op=0x05 data len=16 wait_response=1 timeout=3.000 data=a00000000100000000180000a86bcb3f
TRACE +0.000 Write 26 bytes: 
    c000051000000000 00a0000000010000 | ................
    0000180000a86bcb 3fc0             | ......k.?.
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 3 bytes: 010504
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 2 bytes: 0000
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01050400ee7852c200000000
TRACE +0.016 command op=0x07 data len=176 wait_response=1 timeout=3.000 data=
    a000000000000000 0000000000000000 | ................
    0c40ca3fe0083840 2c09384084093840 | .@.?..8@,.8@..8@
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    cc09384058073840 ba083840fe083840 | ..8@X.8@..8@..8@
    2c09384084093840 cc08384012083840 | ,.8@..8@..8@..8@
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    a4063840a4063840 a4063840a4063840 | ..8@..8@..8@..8@
    720b3840a4063840 f20b3840ca0c3840 | r.8@..8@..8@..8@
TRACE +0.000 Write 186 bytes: 
    c00007b0007c0000 00a0000000000000 | .....|..........
    0000000000000000 000c40ca3fe00838 | ..........@.?..8
    402c093840840938 40520a3840be0a38 | @,.8@..8@R.8@..8
    406c0a3840a80738 400e0a38404e0a38 | @l.8@..8@..8@N.8
    4098093840580738 40cc093840580738 | @..8@X.8@..8@X.8
    40ba083840fe0838 402c093840840938 | @..8@..8@,.8@..8
    40cc083840120838 4042083840c80838 | @..8@..8@B.8@..8
    40160d38402c0938 40d60b3840ca0c38 | @..8@,.8@..8@..8
    40a4063840f40c38 40a4063840a40638 | @..8@..8@..8@..8
    40a4063840a40638 40a4063840a40638 | @..8@..8@..8@..8
    40a4063840a40638 40720b3840a40638 | @..8@..8@r.8@..8
    40f20b3840ca0c38 40c0             | @..8@..8@.
TRACE +0.016 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 4 bytes: 070400ee
TRACE +0.000 Read 2 bytes: 7852
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01070400ee7852c200000000
Running stub...
TRACE +0.000 command op=0x06 data len=8 wait_response=1 timeout=0.200 data=00000000b8053840
TRACE +0.000 Write 18 bytes: 
    c000060800000000 0000000000b80538 | ...............8
    40c0                              | @.
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 4 bytes: 01060400
TRACE +0.000 Read 1 bytes: ee
TRACE +0.000 Read 1 bytes: 78
TRACE +0.000 Read 1 bytes: 52
TRACE +0.000 Read 1 bytes: c2
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01060400ee7852c200000000
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 4f
TRACE +0.000 Read 1 bytes: 48
TRACE +0.000 Read 3 bytes: 4149c0
TRACE +0.000 Received full packet: 4f484149
Stub running...
Changing baud rate to 921600
TRACE +0.000 command op=0x0f data len=8 wait_response=1 timeout=3.000 data=00100e0000c20100
TRACE +0.000 Write 18 bytes: 
    c0000f0800000000 0000100e0000c201 | ................
    00c0                              | ..
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 1 bytes: 0f
TRACE +0.000 Read 2 bytes: 0200
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 010f0200000000000000
Changed.
TRACE +0.059 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=18200060
TRACE +0.000 Write 14 bytes: c0000a04000000000018200060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 9 bytes: 0200000000800000c0
TRACE +0.000 Received full packet: 010a0200000000800000
TRACE +0.007 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=20200060
TRACE +0.000 Write 14 bytes: c0000a04000000000020200060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.001 Read 2 bytes: 010a
TRACE +0.000 Read 9 bytes: 0200000000700000c0
TRACE +0.000 Received full packet: 010a0200000000700000
TRACE +0.005 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=2820006017000000ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0028200060170000 | .........( .`...
    00ffffffff000000 00c0             | ..........
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 7 bytes: 01090200000000
TRACE +0.000 Read 4 bytes: 000000c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.004 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=1820006000000090ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0018200060000000 | .......... .`...
    90ffffffff000000 00c0             | ..........
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 10 bytes: 01090200000000000000
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.006 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=202000609f000070ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 00202000609f0000 | .........  .`...
    70ffffffff000000 00c0             | p.........
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 9 bytes: 010902000000000000
TRACE +0.000 Read 1 bytes: 00
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.005 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=5820006000000000ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0058200060000000 | .........X .`...
    00ffffffff000000 00c0             | ..........
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 5 bytes: 0902000000
TRACE +0.000 Read 2 bytes: 0000
TRACE +0.000 Read 3 bytes: 0000c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.003 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=0020006000000400ffffffff00000000
TRACE +0.001 Write 26 bytes: 
    c000091000000000 0000200060000004 | .......... .`...
    00ffffffff000000 00c0             | ..........
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 11 bytes: 01090200000000000000c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.004 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=00200060
TRACE +0.000 Write 14 bytes: c0000a04000000000000200060c0
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 9 bytes: 0200000000000000c0
TRACE +0.000 Received full packet: 010a0200000000000000
TRACE +0.004 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=58200060
TRACE +0.000 Write 14 bytes: c0000a04000000000058200060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 3 bytes: 010a02
TRACE +0.000 Read 4 bytes: 00c84016
TRACE +0.000 Read 4 bytes: 000000c0
TRACE +0.000 Received full packet: 010a0200c84016000000
TRACE +0.005 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=1820006000000080ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0018200060000000 | .......... .`...
    80ffffffff000000 00c0             | ..........
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 3 bytes: 010902
TRACE +0.000 Read 8 bytes: 00000000000000c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.004 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=2020006000000070ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0020200060000000 | .........  .`...
    70ffffffff000000 00c0             | p.........
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 1 bytes: 01
TRACE +0.000 Read 10 bytes: 090200000000000000c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.004 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=18200060
TRACE +0.000 Write 14 bytes: c0000a04000000000018200060c0
TRACE +0.001 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 9 bytes: 0200000000800000c0
TRACE +0.000 Received full packet: 010a0200000000800000
TRACE +0.005 command op=0x0a data len=4 wait_response=1 timeout=3.000 data=20200060
TRACE +0.000 Write 14 bytes: c0000a04000000000020200060c0
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Read 2 bytes: 010a
TRACE +0.000 Read 6 bytes: 020000000070
TRACE +0.001 Read 3 bytes: 0000c0
TRACE +0.000 Received full packet: 010a0200000000700000
TRACE +0.003 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=2820006007000000ffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 0028200060070000 | .........( .`...
    00ffffffff000000 00c0             | ..........
TRACE +0.000 Read 1 bytes: c0
TRACE +0.001 Read 2 bytes: 0109
TRACE +0.000 Read 4 bytes: 02000000
TRACE +0.000 Read 4 bytes: 00000000
TRACE +0.000 Read 1 bytes: c0
TRACE +0.000 Received full packet: 01090200000000000000
TRACE +0.003 command op=0x09 data len=16 wait_response=1 timeout=3.000 data=1c2000600700005cffffffff00000000
TRACE +0.000 Write 26 bytes: 
    c000091000000000 001c200060070000 | .......... .`...
    5cffffffff000000 00c0             | \.........
....

One of these commits must be the culprit

git log v4.8.dev1..v4.8.dev2 --oneline

162238c (tag: v4.8.dev2) ci: Remove the deploy_docs_production job from the scheduled pipeline
0dd5c7e ci: Add option to run tests with esp-flasher-stub
dad0edc feat(esp32-p4): add spi-connection restriction to ROM class
cf6d94e feat: add UF2 IDs for ESP32-C5 and ESP32-C61
1dc3c8b fix(secure_download_mode): Disable secure boot detection and print more info
0215786 fix(esptool): clear boot control register on ESP32-S3
e34df69 feat(espefuse): Updates efuses for C5 and C61
ef4d8a7 feat(esp32c61): add c61 basic flash support (no_stub)
ab9d756 ci(esp32c5): add host test for esp32c5
a773e6b feat(esp32c5): skipped the stub check for esp32c5 mp
e414cef feat(esp32c5): base support of esp32c5 mp (no stub)
6c28df3 docs: Updated documentation to reflect changes of SHA256 digest recomputation
598b703 refactor(test/esptool): Updated tests according to SHA recomputation for binary
8d26375 feat: Added warning when secure boot enabled
3b0939c feat(cmds/write_flash): Recalculated SHA digest for image binary
6393d6b feat: print flash voltage in flash_id command
6c5cfd6 feat(esptool): Adds wafer and pkg versions
a2bdaa2 fix(intelhex): catch unicode decode errors when convering hex to binary
3301d0f change: fix typos and spelling errors by codespell
6d309e1 ci: add pre-commit hook for codespell
31eb15b feat(espefuse): Update adc_info commands for all chips
31477fb feat(espefuse): Adds new efuses for esp32p4
0c3a09c ci(github-actions): update ci actions for Jira integration
4a6ad55 docs: add esp32p4 target to docs
c750549 docs(sphinx-lint): Add previous commit to .git-blame-ignore-revs
6282f98 docs(sphinx-lint): Fix issues reported by sphinx-lint before adding it to pre-commit
1de1a26 docs(sphinx-lint): Add sphinx-lint to pre-commit, GH and GL pipelines
80304e6 ci(gh_actions): Start build jobs by platform, specify runners
1e79f25 feat(espefuse): Allow the espefuse.py to work when coding scheme == 3
4b87de1 ci(changelog_template): Add a reminder about virus scanning
8f38367 ci(pyinstaller): Limit version to v5.3.12
2d8a3ad feat(err_defs): Add ROM bootloader flash error definitions
bc9f2a6 fix: ROM doesn't attach in-package flash chips
0cabb38 ci: Use ruff instead of flake8 and black in github CI
5ad3c48 refactor(style): Comply with black>=24.0.0
79978c0 docs: Correct bootloader offsets
9f1bde4 docs(esptool): Reflect change from flake8 and black to ruff
1d5fcb3 feat: Use ruff instead of flake8 and black both in pre-commit and CI
2381711 fix: close file gracefully in espsecure
96a5c21 feat(esp32p4): Enable USB-serial/JTAG in flasher stub
956557b fix: Fixed glitches on RTS line when no_reset option on Windows
4c2e113 change(test): generate valid UTF8 binaries for UF2 tests
2c0a5da fix(merge_bin): treat files starting with colon as raw files
bdeec68 feat(espefuse): Postpone some efuses to burn them at the very end
d448851 docs: Add instructions on how to update
bec1865 ci: Add ESP32-P4 target and tests
858ba56 ci: Edit tests to take new segment indexing into account
b5939da fix: Index image segments from 0 instead of 1
8ad6d57 feat: add advisory port locking
f72b5ad feat(espefuse): check_error --recover chip even if there are num_errors
16e4fae feat(espefuse): Adds new efuses for esp32c6 and esp32h2
f1eb65f fix(read_flash): add flash size arg to enable reading past 2MB without stub
8ce5ed3 fix(read_flash): flush transmit buffer less often to inrease throughput
17866a5 fix(esptool): Proper alignment for SoCs with offset load
e948993 fix: ignore resetting on unsupported ports
6ca9b81 ci(dev_releasing): Let patch_dev_release.py accept any version specifier

[therealdreg]

@Dzarda7 This commit is the problem:

956557b

---

commit 956557b
Author: Jakub Kocka jakub.kocka@espressif.com @jakub-kocka
Date: Wed Jan 24 13:20:26 2024 +0100

fix: Fixed glitches on RTS line when no_reset option on Windows

---

git bisect start
status: waiting for both good and bad commits

git bisect bad v4.8.dev2
status: waiting for good commit(s), bad commit known

git bisect good v4.8.dev1
Bisecting: 27 revisions left to test after this (roughly 5 steps)
[1e79f25] feat(espefuse): Allow the espefuse.py to work when coding scheme == 3

git bisect bad
Bisecting: 13 revisions left to test after this (roughly 4 steps)
[2c0a5da] fix(merge_bin): treat files starting with colon as raw files

git bisect good
Bisecting: 6 revisions left to test after this (roughly 3 steps)
[79978c0] docs: Correct bootloader offsets

git bisect bad
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[96a5c21] feat(esp32p4): Enable USB-serial/JTAG in flasher stub

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[956557b] fix: Fixed glitches on RTS line when no_reset option on Windows

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[4c2e113] change(test): generate valid UTF8 binaries for UF2 tests

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956557b is the first bad commit
commit 956557b
Author: Jakub Kocka jakub.kocka@espressif.com
Date: Wed Jan 24 13:20:26 2024 +0100

fix: Fixed glitches on RTS line when no_reset option on Windows

esptool/loader.py | 12 +++++++++++-
test/test_esptool.py | 3 ---
2 files changed, 11 insertions(+), 4 deletions(-)

git bisect reset

git checkout 956557b
HEAD is now at 956557b fix: Fixed glitches on RTS line when no_reset option on Windows

python esptool.py --port COM23 --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting............

git checkout "956557b^"
Previous HEAD position was 956557b fix: Fixed glitches on RTS line when no_reset option on Windows
HEAD is now at 4c2e113 change(test): generate valid UTF8 binaries for UF2 tests

python esptool.py --port COM23 --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

esptool.py v4.7.0
Serial port COM23
WARNING: Pre-connection option "no_reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connecting....
Chip is ESP32-C2 (revision v1.2)
Features: WiFi, BLE
Crystal is 26MHz
MAC: 78:ee:4c:6c:35:2c
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
Flash will be erased from 0x00000000 to 0x00004fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x00010000 to 0x000c9fff...
Flash will be erased from 0x00300000 to 0x003fffff...
Compressed 19584 bytes to 12182...
...

Linux esptool v5.0.2 works

python esptool.py --port /dev/ttyACM0 --chip esp32c2 --baud 921600 --before no_reset --after no_reset write_flash -z --flash_mode dio --flash_freq 60m --flash_size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin

Warning: DEPRECATED: 'esptool.py' is deprecated. Please use 'esptool' instead. The '.py' suffix will be removed in a future major release.
Warning: Deprecated: Option '--flash_mode' is deprecated. Use '--flash-mode' instead.
Warning: Deprecated: Option '--flash_freq' is deprecated. Use '--flash-freq' instead.
Warning: Deprecated: Option '--flash_size' is deprecated. Use '--flash-size' instead.
Warning: Deprecated: Choice 'no_reset' for option '--before' is deprecated. Use 'no-reset' instead.
Warning: Deprecated: Choice 'no_reset' for option '--after' is deprecated. Use 'no-reset' instead.
Warning: Deprecated: Command 'write_flash' is deprecated. Use 'write-flash' instead.
esptool v5.0.2
Serial port /dev/ttyACM0:
Note: Pre-connection option "no-reset" was selected. Connection may fail if the chip is not in bootloader or flasher stub mode.
Connected to ESP32-C2 on /dev/ttyACM0:
Chip type:          ESP32-C2 (revision v1.2)
Features:           Wi-Fi, BT 5 (LE), Single Core, 120MHz
Crystal frequency:  26MHz
MAC:                78:ee:4c:6c:35:2c

Stub flasher running.
Changing baud rate to 921600...
Changed.

Configuring flash size...
Flash will be erased from 0x00000000 to 0x00004fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x00010000 to 0x000c9fff...
Flash will be erased from 0x00300000 to 0x003fffff...
SHA digest in image updated.
Compressed 19584 bytes to 12182...
Writing at 0x00000000 [                              ]   0.0% 0/12182 bytes..Wrote 19584 bytes (12182 compressed) at 0x00000000 in 1.4 seconds (113.8 kbit/s).
Hash of data verified.
Compressed 3072 bytes to 119...
Wrote 3072 bytes (119 compressed) at 0x00008000 in 0.1 seconds (486.2 kbit/s).
Hash of data verified.
Compressed 758336 bytes to 438246...
Writing at 0x00010000 [                              ]   0.0% 0/438246 bytes.Writing at 0x0001c795 [>                             ]   3.7% 16384/438246 byWriting at 0x00033a9a [===>                          ]  15.0% 65536/438246 bytes... ^C
Staying in bootloader.                                                                                                                                                                                                               

[therealdreg]

@Dzarda7 as you can see, the problem is on Windows

956557b

                self._port = serial.serial_for_url(
                    port, exclusive=True, do_not_open=True
                )
                if sys.platform == "win32":
                    # When opening a port on Windows,
                    # the RTS/DTR (active low) lines
                    # need to be set to False (pulled high)
                    # to avoid unwanted chip reset
                    self._port.rts = False
                    self._port.dtr = False
                self._port.open()

The same uart-bridge-pico firmware works perfectly on Linux with the latest ESPTOOL v5.0.2.

[therealdreg]

@Dzarda7 I fixed it! 🎉 🎉

RP2040 PICO UART BRIDGE FIRMWARE FOR ESP: https://github.com/therealdreg/okhi/blob/main/stuff/pico-uart-bridge-dregmod/uart-bridge.c

I no longer filter with tud_cdc_n_connected() → I always process the CDC (so if esptool opens the port with DTR=0, we’ll still be reading) + tud_cdc_line_state_cb():

while (1) {
    int itf;
    int con = 0;

    tud_task();

    // DREG MOD
    for (itf = 0; itf < CFG_TUD_CDC; itf++) {
        usb_cdc_process(itf);
    }
    // END

    /* OLD CODE:

                    for (itf = 0; itf < CFG_TUD_CDC; itf++) {
                        if (tud_cdc_n_connected(itf)) {
                            con = 1;
                            usb_cdc_process(itf);
                        }
                    }
                    gpio_put(LED_PIN, con);

    */

    gpio_put(LED_PIN, tud_mounted());
}

void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
{
    gpio_put(CHIP_PU_EN_RST_PI28_ES8, rts ? 0 : 1);
    gpio_put(EBOOT_PI14_ES9,          dtr ? 0 : 1);
}

And now flashing works perfectly again on Windows with the latest esptool v5.0.2:

C:\Users\regue\Desktop\bcks\okhi\github\okhi\20250831145648\ps2>esptool.exe --port "COM23" --chip esp32c2 --baud 921600  write-flash -z --flash-mode dio --flash-freq 60m --flash-size 4MB 0x0000 bootloader.bin 0x8000 partition-table.bin 0x10000 okhi.bin 0x300000 storage.bin
esptool v5.0.2
Connected to ESP32-C2 on COM23:
Chip type:          ESP32-C2 (revision v1.2)
Features:           Wi-Fi, BT 5 (LE), Single Core, 120MHz
Crystal frequency:  26MHz
MAC:                78:ee:4c:6c:35:2c

Stub flasher running.
Changing baud rate to 921600...
Changed.

Configuring flash size...
Flash will be erased from 0x00000000 to 0x00004fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x00010000 to 0x000c9fff...
Flash will be erased from 0x00300000 to 0x003fffff...
SHA digest in image updated.
Wrote 19584 bytes (12182 compressed) at 0x00000000 in 1.4 seconds (112.6 kbit/s).
Hash of data verified.
Wrote 3072 bytes (119 compressed) at 0x00008000 in 0.1 seconds (420.3 kbit/s).
Hash of data verified.
Wrote 758336 bytes (438246 compressed) at 0x00010000 in 41.5 seconds (146.3 kbit/s).
Hash of data verified.
Wrote 1048576 bytes (5635 compressed) at 0x00300000 in 5.8 seconds (1455.5 kbit/s).
Hash of data verified.

Hard resetting via RTS pin...

Now it works on Windows and Linux with the latest version 🎉

[therealdreg]

My conclusion: on Windows, esptool opens the port with DTR=0, and if you use tud_cdc_n_connected as a filter for the CDC you’ll run into problems. In addition, you need to handle DTR and RTS with CHIP PU and EBOOT so everything works correctly.

@Dzarda7 Maybe you should document this in the troubleshooting section of the website?

btw, I created this: https://github.com/therealdreg/pico-esp-flasher

[Dzarda7]

Glad to hear that @therealdreg. Good job with debugging it. I think you did not handle the DTR and RTS properly prior your fix (but I did not check it much). Port is most of the time on all platforms open with DTR=false, RTS=false (which means both in log. 1), both can also be true, but it is quite rare I believe, but platform dependent.

The issue the commit fixed was that Windows glitched the DTR, RTS while connecting, but still ended up in the state above I believe. The fix solved the glitches. So I am not sure if there is anything to be documented. The fix you introduced by handling the RTS and DTR using tud_cdc_line_state_cb is the correct one, so good job with that. Now you do not need to use --before no_reset and it should be handled correctly.