The ability to downgrade to older firmware versions on the iPhone 4S, iPad 2 and iPhone 3 is 6 iOS by Apple limited and potentially even impossible. Since 0.9.11b1 redsn0w it was also possible for these devices using a per device and per unique firmware version Apple signature to older firmware versions to recover. Two vulnerabilities which were used in turn made the first beta of iOS 6 by Apple to be solved.
More specifically, according to Muscle Nerd of the iPhone Dev Team for two changes regarding APTickets, preventing it from coming back in the manifest file and can not be beaten during the restoration. The changes will not prevent the iPhone 3G, iPhone 4 and 4th generation iPod touch to an older firmware version is restored, since these devices are for the limera1n -exploit. It operates by George Hotz was made public in October 2010 is not by Apple to patch because it uses a vulnerability in the bookroom of these devices. It would possibly still be able to prove to the iPhone 4S, iPad 2 and iPad 3 to restore to versions of IOS 4 and 5, as long as you before benodige ShSh files on time have beaten using Tiny Umbrella (Linux, Mac OS X and Windows).
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