I picked up a second-hand Motorola Moto G (2nd gen) device. The model is technically XT1064 (Titan).
On my Windows machine, I'm sometimes able to see an error message when I power down the phone stating that the USB device was unrecognized (Device Descriptor Request Failed).
After days of trying, I've yet to have it show up in adb
. But it works just fine if I boot into the bootloader and run fastboot
commands!
I've tried all of the "easy" things people recommend:
- enabling USB debugging under Developer Options
- different USB cables (although since
fastboot
works fine, that implies the cable is also fine) - different computers (tried a Mac, a Windows 10 machine, and a Windows Vista laptop)
adb kill-server
followed byadb devices
- various
adb
versions (Android SDK platform tools and Universal ADB driver) - manually uninstalling Windows drivers
- force installing drivers (doesn't work, since the device doesn't make it past the device descriptor request so Windows won't allow drivers to be installed)
- installing the Universal ADB driver
- re-flashing the device (tried stock Marshmallow, stock KitKat, and Lineage OS)
I'm frustrated by the process because fastboot
works just fine. That's how I've flashed the separate ROMs on there.
If this were a hardware issue with USB, why would it be that fastboot
operates correctly but adb
does not?
Also, if it's a hardware issue, what physical part would be the problem? It seems unlikely to be the USB port itself (again, because fastboot
works just fine). Is there some kind of USB controller in the phone that could be the issue? Since the device is pretty useless to me unless adb
works, I'd entertain the idea of trying to solder in a new part to fix the problem if I could!