u/Kinnirasna

Hello all,

I have an old router (AOT-5221ZY, RTL9607DQ SoC) and managed to access its UART interface at 115200 baud using an ESP32. I was able to interrupt the normal boot process and reach a prompt that shows:

ZHAL>

However, I seem to be stuck at this point. The shell accepts input (including newlines), but it produces no output in response to any commands.

I have tried commands like:

• help
• ?
• boot
• env

but none of them return any output, the prompt just reappears.

Is there a way to proceed further from here, or at least get a basic command like help to execute?

Thanks.

The board

J1: UART contacts, where I connected

The UBOOT/ZHAL shell

Full normal boot log: https://gist.github.com/ShravanAYG/a7a13eeb904fcad54d53690a0c08b8d9