Thanks for your reply. In my case it has nothing to do with the 2G signal, the button only works when the phone it's plugged. I've had this problem with different roms.
Hi I need some help.
I got a Mi5 a few weeks ago, and right now I'm running MiUi 8 6.7.14
My back button is not working at all, it worked fine for the first two days but now it does nothing when I press it. The only way to make it work is plugging an usb charger. Can i fix that with software...