Warning !!!

Before flashing Android 8 firmware ( version ROO-1xx ) - check IDENTIFY !!!

if phone have firmware version ROO-1xxx - you can safely flash Android 8 firmware.

if phone have firmware version 2xxx,4xxx - 
you MUST flash ROO_Downgrade_Android_P.NBx BEFORE flashing Android 8 firmware.

you can always fix phone by using BootFix_ROO.zip