a while ago i traded with a shady guy my tablet with an iPad 3 ,it was working fine until i tried to restore it ,i got a nice screen asking for an i cloud id, i tried contacting the guy but poof vaporware, i contacted apple and they don't feel obliged to help ,i am stuck with a brick that cost me 300e in the end .what i learn t from this ,that apple has an icloud service which can be a pain in the ass and while you are cheated to try to unlock it via other ways will open a hole to pocket .nevertheless the lesson is never buy something you dont know of it well .