answer:To truly re-virginize an iPhone from a jailbroken state, you need to do a full restore in iTunes and choose “set up as a new phone,” NOT “restore from backup.” Restoring from backup will leave some superfluous files from any third-party apps you might have installed. Setting it up as a new phone will erase all your contacts, media, mail, etc., so make sure your address book is up to date on your computer before you restore. Unless you have unlocked your phone, you can’t screw up your phone so bad that it cannot be repaired.