How to fix a device not detected through USB in Android, TWRP and Fastboot mode? My Android tablet Nexus 9 is not recognized by my laptop. It can be charged, but not be listed by lsusb command even in fastboot mode and TWRP. I suppose I accidentally disabled the USB connection through some command as root user.  Is there anyway to check the status of the USB device of Android?
It was physically broken. I replaced usb board, then the problem was fixed.