I can't login my devices, can't factory reset, can't wipe T.T
It's A501
Same problem happen to me, I installed TWRP and use "wipe cache" function so it become "E: failed to mount /cache". After 3 hour try and error, I found that you can go to fastboot mode then choose factory reset, after clicking factory reset, it still prompt you some error like "error wiping cache" and the screen backlight goes off, you can't turn it on by clicking any button or screen, BUT PLEASE WAIT , wait for around 5mins and factory reset is done then you are good to go :good: