How to reset factory My archer C7 if reset button borken

Now, my archer c7 like switch. It doesn't have IP, it is bridge mode. I can use internet by cable port. I tried to reset factory by reset button but is didn't work. The light of reset is off when I pressed it before power AP on. I used tftp by ip, it is failed
Another way, I already had to used serial console but nothing on the screen. No way to connect it now.

Anyone advice me anything for this case.
Thanks you so much

You could open the case to:

  • repair the button; or to
  • temporally jumper the soldier points for the button
  • connect to the serial port

I tried it but it didn't work. Maybe I will keep it for using like switch, Thanks you so much