Can't enter recovery
I followed the steps but cannot get into recovery, after doing the easy way it automatically reboots the phone. If I manually try to go into recovery I see the little android with a small red triangle and pressing the volume up plus power buttons has no effect and eventually reboots into setup again.
I also tried the manual way and had the same issues - can't get into recovery to do full wipe, etc to complete the process.
When I unlocked and rooted originally it loaded twrp recovery, not sure if this is causing the issues.
What can I try?