Just got a iPad Air so I'm going to be selling my iPad 4. How do I make sure that I fully restore it like brand new for the new owner. I keep reading about people not being able to active an iPad because they don't have the previous owner's Apple ID. I've restored a couple of iDevices of relatives on iOS 7 and nothing about it not being able to be activated because of a missing Apple ID. I just go on iTunes and press restore. Is there something else I have to do?