I have done over 6 hours of researching through this site along with many, many others. The most common reply to "unjailbreak" or remove jailbreak is to simply restore. Most state to put into DFU mode, or recovery mode. I have tried these along with uninstalling Itunes, running as administrator. I would simply like to restore my Iphone back to stock IOS (5.1.1). I plan on trading my iphone in for a new one with AT&T and they require it to be in stock condition. Any help would be great. P.S. When I have tried the above suggestions I can get restore complete but then get stuck at an itunes error stating, "Their is no sim card detected in the Iphone you are attempting to activate" yadaada. Thus rendering my Iphone useless. Please help. Mucho Gracias for any replies.