hammerhead D821(E) 32GBLOCK STATE - unlocked1) Reverted to stock:"6.0.1 (M4B30Z, Dec 2016)";Factory Images for Nexus and Pixel Devices | Google Play services | Google for Developersdevelopers.google.comby using the "./flash_all.bat"-method2) Enabled developer mode + USB-debugging + Allowed my computer3) "adb reboot bootloader"