This tool is absolutely rubbish. It just prepares your idevice into a pwned state and makes a custome firmware. You cant update/restore to any ios 5 in dfu mode so you just get itunes errors (20,21,1600,1618,3201,3202). Its easier to update ro 5.0b7, jailbreak with redsnow and then delete script text with iphonebrowser, at least this works on all my devices