Left button for PIN entry not functioning on Windows USB for TTGO Jade wallet DIY

[bayfitt]

Description:
I would like to report a bug for the TTGO Jade wallet DIY. I have tested the wallet on USB on Windows, Linux, and Android. When I went to enter my PIN, the left button on the TTGO did not work on Windows, while the right button was functional. I have a video recording of the issue, which I can share with the developers. I consistently experienced this issue even after restarting both the wallet and the computer on Windows. On the other hand, on Linux and Android on USB, everything worked fine. Additionally, Bluetooth on Android worked as expected, and both buttons functioned correctly when entering my PIN.

Details:

• Issue: The left button on the TTGO did not work when entering my PIN on Windows
• Reproduction Steps:
  1. Power on the TTGO Jade wallet DIY
  2. Connect it to a Windows computer via USB
  3. Try to enter your PIN using the left button
• Expected Result: The left button should work correctly, allowing me to enter my PIN.
• Actual Result: The left button does not work on Windows, preventing me from entering my PIN.
• Video Evidence: I have a video recording of the issue, which I can share with the developers.
• Firmware version: 0.1.47-19-ga509904
• Secure Boot enabled: Yes

Additional Notes:

• The issue was not present on Linux and Android on USB.
• Bluetooth on Android worked as expected, and both buttons functioned correctly when entering my PIN.
• I would appreciate it if the developers could investigate this issue and provide a fix as soon as possible.

[bayfitt]

Working normally on Linux

1_5064448508560409232.mp4

Not working on windows

1_5064448508560409231.mp4

[jpph]

As a temporary workaround, you can use electrum for windows to unlock the ttgo display (button are working ok with electrum), then close electrum, then launch Blockstream Green for windows. You will be able to connect to it.

[bayfitt]

My concern was not about it not working in windows. I can use Linux or Android. My concern is that it works differently, which means there is something going inside the computer from that wallet. Why should it work differently in different OSes, if it is supposed to be isolated? To me, this is a security concern.

[jpph]

As per cryptoguide suggestions there is some simplified input mode and transfer protocol (based on jadepy) when connected to other software than green wallet. Seems that green wallet android and Linux version are using the simplified mode

[JamieDriver]

This sounds v odd to me - you are not re-flashing the device between using on windows and linux, right ?

• You plug it into linux, and can use both buttons and unlock the device with PIN
• You plug the same device/same fw etc. into windows, and the left button does not work ?

This is certainly not expected.
If I had to hazard a guess I'd say that maybe there is some pin/interrupt conflict that windows is triggering which is somehow disrupting detecting the button press. ('pin' as in physical pin on the board, not as in 'personal id number'!)

[jpph]

It is not just ''windows''. It is working fine with electrum on windows.

[JamieDriver]

So you plug a lilygo t-display into Green Desktop on Windows, and the left button does not work ?
(iirc the right and left buttons should scroll the numbers up/down, and you press both together to move to 'next digit' ?)

We will certainly investigate - as you say the unit buttons should not be affected by whatever happens to be on the other end of the USB cable!

[jpph]

I have same behavior that on the video. At first digit left button act as ''both button'', then at second digit it stop working. And both button stop working too. Very strange behavior

[JamieDriver]

Looks like something specific to Green Desktop (on windows) rather than an issue with the Jade ttgo fw per se. (eg. setting some usb/serial flags badly, voltage on wrong pins, etc.). We have reproduced the issue and agree something v odd happens to that left button.
We'll investigate further - thanks for bringing it to our attention!

[sandman21vs]

I'm having exactly the same problem, the tip to connect the electrum was good, I hadn't thought of that, thanks.
I hope they fix this bug soon and it's not a security breach

[JamieDriver]

Are you running the fw with BLE/radio enabled ?

[sandman21vs]

I'm running directly connected to the cable