The test model, the Nexus 6P

brush steps
Power key + volume button to enter rec mode to choose the wipe can be removed, in addition to the internal storage (installation package on the inside) wipe after success, return to the interface select install select flash in the install package directly open the brush if ERROR7 mistakes, returned to the main interface, select the mount, cancel and then began to brush in front of the system) can generally in just after entering the rec interface, click the mount interface, will find that in front of the system not check the number, In other words, there is no mounted system, but when you enter mount again after sanqing, you will find that the system is mounted, cancel the check sign in front of the system, and then go to install to remove the error 7