I bought a second hand Razr Maxx that had been rooted using Droid Razr Utility 1.7. When I went to get a Sim card it would not recognize the new one. We are guessing the guy rooted it, then cleared all the data, but the root remained. So, can someone explain like I am mildly stupid how to get it back completely cleared and restored to factory. I have read a dozen threads on this subject and its all new to me. I jailbroke my iphone 3 or 4 times so I have some experience with this type of thing, but any help would be greatly appreciated.