Official high-performance OpenWrt build — Linux 6.18 (AArch64, 64-bit) — purpose-built for the Jio AirFiber IDU router (JIDU6811 / JIDU6J11-6811).
- 🧭 Overview
- ☕ Support This Project
- 📊 Hardware Specifications & Subsystem Status
- 🔑 Default Firmware Settings
- 📦 Release Files Explained
- 🚨 Safety Notice
- 🛠️ Prerequisites & PC Setup
- 🔌 Hardware Serial UART Connection
- 🔐 U-Boot Login & Password Retrieval
- 🚀 Step 1: Safe RAM Boot via TFTP (Testing Mode)
- 🌐 Step 2: Accessing OpenWrt
- 💾 Step 3: Permanent Production Installation (Persistent Flash)
- 💡 Tips & Advanced Features
- ❓ Comprehensive Troubleshooting & FAQ
- 🤝 Contributing
- 📄 License
MaxNet is custom OpenWrt firmware for the Jio AirFiber IDU (Indoor Unit) router, replacing the limited stock firmware with a full Linux-based router operating system. Built on the Qualcomm[...]
Whether you want faster throughput, advanced firewall/VPN control, USB tethering fallback, or full ownership of your router, MaxNet turns a Jio AirFiber IDU into a genuine high-performance OpenWrt[...]
Note
New to OpenWrt or router flashing? Read this entire guide once before starting. Step 1 (RAM boot) is completely reversible and lets you try everything safely before making any permanent chan[...]
💡 Fuel development & keep this project actively maintained!
Building and maintaining custom firmware for modern Wi-Fi 6 Qualcomm hardware takes extensive reverse engineering, testing, and support. If MaxNet helped you, consider supporting the work.
UPI Payment:
9824584454@ybl
| Subsystem | Status | Technical Details |
|---|---|---|
| CPU Architecture | 🟢 Working | Quad-Core ARM Cortex-A73 @ 2.2 GHz (AArch64 64-bit, Linux 6.18) |
| RAM Storage | 🟢 Working | 512 MB DDR4 RAM @ 1600 MHz |
| Flash Memory | 🟢 Working | 256 MB Winbond SPI Serial NAND (W25N02KWZEIR) with UBI / UBIFS Overlay |
| Switch & Ethernet Ports | 🟢 Working | 1x 2.5G/1G WAN (Blue Port) + 4x Gigabit LAN (Yellow Ports) via Qualcomm PPE Hardware NAT Acceleration |
| 5 GHz Wi-Fi 6 | 🟢 Working | Qualcomm QCN9074 PCIe (ath11k_pci), HE80/HE160 @ Channel 36, 30.00 dBm (MaxNet-5G, 100% Signal) |
| 2.4 GHz Wi-Fi 6 | 🟢 Working | Qualcomm IPQ9574 AHB (ath11k_ahb), Hexagon Q6 DSP, HT20/HE20 @ Channel 1, 30.00 dBm (MaxNet-2.4G, 100% Signal) |
| USB 3.0 & 4G/5G Tethering | 🟢 Working | SuperSpeed USB 3.0 Host + Android/iPhone Mobile USB Tethering (rndis / cdc_ether) |
| LuCI Web Dashboard & SSH | 🟢 Working | Web UI: http://192.168.1.1 | SSH: root@192.168.1.1 (Port 22) |
| Dynamic 3-Stage LEDs | 🟢 Working | 🔴 Booting → 🔵 Ready / Standby → 🟢 Online (Internet Reachable) |
| Setting | Default Value | Notes |
|---|---|---|
| Router IP Address | 192.168.1.1 |
Subnet: 255.255.255.0 (/24) |
| Web Interface (LuCI) | http://192.168.1.1 | Accessible from any connected LAN port or Wi-Fi |
| SSH Access | ssh root@192.168.1.1 |
Port 22 |
| Root Password | (None / Blank by default) | Set your password via LuCI or passwd command |
| Default 2.4 GHz SSID | MaxNet-2.4G |
Channel 1 (HT20), Open |
| Default 5 GHz SSID | MaxNet-5G |
Channel 36 (HE80), Open |
| Default Wi-Fi Password | Open / No password | Configure WPA2/WPA3 in LuCI → Network → Wireless |
| Serial Console Baudrate | 115200 8N1 |
Flow control: None |
Important
Default Wi-Fi networks are open (unencrypted). Set a WPA2/WPA3 password and change the root password immediately after your first login — see the [FAQ](#-comprehensive-troubleshooting-[...]
Every release provides three firmware binaries tailored for different stages:
| File Name | Typical Size | Primary Purpose | How to Use |
|---|---|---|---|
initramfs.itb |
~16.6 MB | RAM Boot & Testing (No Risk) | Loaded into memory via TFTP in U-Boot (tftpboot 0x46000000 initramfs.itb → bootm 0x46000000). Leaves NAND untouched. |
sysupgrade.bin |
~14.7 MB | Permanent Production Flash & Web Upgrades | Used to install or upgrade OpenWrt permanently with persistent storage via LuCI Web UI or sysupgrade command.[...] |
factory.ubi |
~15.5 MB | Raw UBI NAND Container | Raw UBI image formatted for the NAND ubi partition, containing separate kernel and rootfs squashfs volumes. |
Warning
Flashing custom firmware modifies your router at a low level. Step 1 (RAM boot) is 100% reversible, but Step 3 (permanent flash) overwrites your current firmware. Please read before pro[...]
- Confirm your exact model (
JIDU6811orJIDU6J11-6811) printed on the device label before flashing anything. - Never disconnect power or Ethernet during an active flash or
sysupgrade— this can corrupt the flash and hard-brick the device. - Never connect the UART VCC pin — see Hardware Serial UART Connection.
- Flashing third-party firmware voids any manufacturer warranty.
- Always validate with Step 1 (RAM boot) first before committing to a permanent flash in Step 3.
- This is community firmware provided as-is. Proceed at your own risk, and keep the U-Boot serial console connected during your first flash in case recovery is needed.
- Jio AirFiber IDU Router (
JIDU6811/JIDU6J11-6811) - USB-to-UART 3.3V Serial Adapter (CP2102, CH340, FT232, or PL2303)
- Ethernet Cable (Cat5e / Cat6)
- Linux PC (Ubuntu / Debian / Fedora / Arch)
sudo apt update && sudo apt install -y minicom tftpd-hpa curlRun this once so you never need sudo chmod 777 /dev/ttyUSB0 again:
echo 'KERNEL=="ttyUSB*", MODE="0666", GROUP="dialout"' | sudo tee /etc/udev/rules.d/99-ttyusb.rules && echo 'KERNEL=="ttyACM*", MODE="0666", GROUP="dialout"' | sudo tee -a /etc/udev/rules.d/99-tt[...]Tip
Log out and back in (or reboot) afterward so your new dialout/tty group membership takes effect.
Connect your USB-to-UART adapter to the router's internal UART header pins:
| USB-to-UART Adapter | Router UART Pin |
|---|---|
| GND | GND |
| TX | RX |
| RX | TX |
Warning
Do NOT connect the VCC (3.3 V / 5 V) pin. Power the router only through its original 12 V DC wall adapter. Connecting VCC from your USB adapter can damage both devices.
Open the serial console on your PC:
minicom -D /dev/ttyUSB0 -b 115200During boot, if prompted for credentials:
| Field | Value |
|---|---|
| Username | ________ |
| Password | ________________ |
ℹ️ Observed Pattern (JIDU6801 / JIDU6701):
- Username → last 8 digits of the RSN printed on the barcode sticker on the back of the router.
- Password → the reversed username digits + an 8-character suffix (e.g.
9rOL8bjrorpYunNk45).Example: if the RSN is
RTHHGAK00123456, the username is00123456and the password is654321009rOL8bjr.
If you already have SSH access on the stock firmware, you can read the exact password directly:
gm_factory_init.sh get uboot_passwd/usr/bin/jioMfgData get ubootPasswdstrings /dev/mtd7 | grep -i passTesting in RAM is 100% risk-free — nothing is written to flash memory until you're satisfied and choose to proceed to Step 3.
Connect your PC's Ethernet cable to the router's LAN4 (or WAN) port:
sudo ip addr flush dev eth0
sudo ip addr add 192.168.1.2/24 dev eth0
sudo ip link set eth0 up(Replace eth0 with your PC's actual network interface name from ip link.)
sudo mkdir -p /srv/tftp
sudo chmod -R 777 /srv/tftp
sudo curl -sL https://github.com/mahendraplus/maxidu/releases/latest/download/initramfs.itb -o /srv/tftp/initramfs.itb
sudo systemctl restart tftpd-hpaPower on the router and press any key in the serial console to stop autoboot. Enter your unit's U-Boot username and password.
At the IPQ9574# prompt, enter these commands one at a time:
setenv ipaddr 192.168.1.10setenv serverip 192.168.1.2dcache off; icache offsetenv fdt_highsetenv initrd_highsetenv bootargs "console=ttyMSM0,115200n8 earlycon"tftpboot 0x46000000 initramfs.itbbootm 0x46000000Within about 10 seconds of booting:
- Via Browser — open http://192.168.1.1 and click Login (no password required).
- Via SSH:
ssh root@192.168.1.1
- Via Wi-Fi — connect to
MaxNet-2.4GorMaxNet-5Gfrom your phone or laptop (both broadcast at full signal with no password).
Once you've confirmed everything works in RAM boot mode, make it permanent. This installs OpenWrt so it boots in ~1 second and keeps all Wi-Fi settings, passwords, and packages across reboots[...]
- Download
sysupgrade.binfrom the Latest Release. - Open your browser and navigate to:
http://192.168.1.1/cgi-bin/luci/admin/system/flash - Scroll to Flash new firmware image and click Flash image....
- Select the downloaded
sysupgrade.binand click Upload. - On the Flash image? confirmation screen:
- Size:
~14.74 MiB - You may see a notice —
invalid sysupgrade file Image check failed.— this is expected when flashing from the RAM/stock environment.
- Size:
- Check ☑️ Force upgrade (allows flashing even though the format check warns).
- Uncheck Keep settings if you want a clean installation.
- Click Continue.
- The router writes the UBI partition and reboots permanently within ~30 seconds.
- Transfer
sysupgrade.binfrom your PC to the router:cat sysupgrade.bin | ssh root@192.168.1.1 "cat > /tmp/sysupgrade.bin"
- Run sysupgrade on the router (
root@Maxnet:~#):sysupgrade -F -v -n /tmp/sysupgrade.bin
Once the router restarts, at the IPQ9574# prompt, enter these commands one at a time:
setenv bootcmd "ubi part ubi; ubi read 0x44000000 kernel; bootm 0x44000000"setenv fdt_highsetenv initrd_highsaveenvresetYour router is now permanently running full OpenWrt Production Mode:
- ⚡ 1-Second Instant Boot — loads the optimized kernel directly from the UBI partition.
- 💾 Persistent Flash Storage — Wi-Fi passwords, SSIDs, network settings, and installed packages all survive reboots.
- 🚫 No Recovery Warning — LuCI runs in full production read-write mode.
Plug an Android phone or iPhone into the USB 3.0 port and enable USB Tethering in the phone's settings. The router automatically detects the connection (wan_usb interface) and shares mobile[...]
An automated hardware daemon continuously monitors network connectivity:
- 🔴 Red Solid — router is booting and initializing hardware peripherals.
- 🔵 Blue Solid — OpenWrt is ready (LAN & Wi-Fi active, waiting for WAN/Internet).
- 🟢 Green Solid — connected to the Internet (gateway and DNS reachable).
Check active wireless status and signal strength from the router terminal:
iw deviwinfo phy0-ap0 infoiwinfo phy1-ap0 infoA: When migrating from stock firmware or an initial RAM boot (initramfs.itb), OpenWrt's metadata validator can't find an existing board profile in flash. Check the ☑️ Force upgrade [...]
A: U-Boot's serial console input buffer has a strict line-length limit (~64 characters). Avoid pasting long, multi-command chains as a single line — run each command separately, exactly as [...]
A:
- Confirm your PC's Ethernet static IP is set to
192.168.1.2/24. - Temporarily disable any active PC firewall:
sudo ufw disable. - Check the TFTP service status on your PC:
sudo systemctl status tftpd-hpa. - Connect the router and PC directly, or through a simple unmanaged switch — some managed switches block TFTP/BOOTP traffic.
A: Open http://192.168.1.1 → Network → Wireless, click Edit on radio0 (5G) or radio1 (2.4G), set your desired SSID and WPA2/WPA3 password, then click[...]
A: Open LuCI → System → Administration, enter a new password, and click Save & Apply. From SSH, run passwd and follow the prompts instead.
A: Confirm the baud rate is 115200 8N1, make sure TX/RX aren't swapped (adapter TX → router RX, and vice versa), verify GND is connected, and check that /dev/ttyUSB0 (or /dev/ttyACM0) appe[...]
A: Open a new GitHub Issue with your exact model number, the step you're stuck on, and any serial console output — this makes diagnosis much[...]
Special thanks to "Sandiep" (https://github.com/Sandiep) for the research, PRs, reverse-engineering, debugging, fixes, and continuous support that helped make this firmware possible.
A lot of what I learned during this project came from his work and guidance.
Huge respect and thank you, Sandiep. ❤️
Contributions, bug reports, and feature requests are welcome!
- 🐛 Found a bug? Open an issue.
- 🔧 Want to improve something? Fork the repo, make your changes, and submit a pull request.
- ⭐ If this project helped you, consider starring the repository — it helps others discover it.
This project is released under the license specified in the LICENSE file of this repository.
Made with ❤️ for the OpenWrt & Networking Community.