Unfortunately your phone may get backdoored in that scenario anyway if it's known to have that feature. In graphene and most Android phones with unlocked flashi

Unfortunately your phone may get backdoored in that scenario anyway if it's known to have that feature. In graphene and most Android phones with unlocked flashing, easily achieved in a few minutes. (Special recovery. It's hard to catch if done right.) There's no way around the wipe at least and better hope the bugger installed is not persistent in some firmware.