[Resolved] How to unbrick MiFi?

I just compiling my own firmware, something goes wrong and now i got device without gui and ssh, internet still working but after ~10 minutes everything stop working and device is freezing.
I managed to connect rx/tx com-port usb adapter to my computer. I see in terminal everything on screen, BUT terminal only show the screen output but not let interrupt anything there by keyboard, looks like no input channel, can only see but not interact with console. Anyone can tell me what to try next? thnx!

Could you please take a screenshot of the uboot log?

Seems that your firmware is having problems.

You can always unbrick by flashing the stock firmware using boot

https://docs.gl-inet.com/en/3/troubleshooting/debrick/

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Thank you, alzhao, you saved my day! : D