Help

I have recently updated my phone to 91.1. But now my phone just cant turn on. I can only go to fastboot mode. I cant reboot it. As far as I understand i have to do this:



1. When I try to enter recovery it just blinks for a second and the phone reboots. How do I get into recovery?

Use Vol-Down + Power to enter fastboot mode. Now connect the phone to the PC and use 'fastboot erase cache'. After that it should be able to boot recovery correctly. (it's from this forum's first page from frequently asked questions).



But I do not understand how to use fastboot erase cache. Can anyone help me?