If you going from original to rooted, you need to wipe. It replaces everything including your modem. If going from rooted, to stock the same applies. Need to wipe in order to reload the original firmware. Phone got stock on a boot loop until i formated it. Anyway, the only complaints i have is the epic lag on the unlock screen. Sweet baby toad. Sometimes i fear its just never going to unlock, then i press it again and it unlocks locks insta. There must be a fix for this somewhere.