The flexibility to downgrade to older firmware variations on the iPhone 4S, iPad 2 and the brand new iPad three, Apple restricted and probably even inconceivable. Because the Redsn0w zero.9.11b unencumber made conceivable for these units the use of a per software and per distinctive firmware model Apple signature ( ShSh blobs ) to older firmware variations to recuperate. Two vulnerabilities which was once utilized in flip made the primary 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 thelimera1n -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 bootrom of these devices.

 It would possibly still be able to prove to the iPhone 4S, iPad 2 and the new iPad be able to restore iOS 4 and 5 version, as long as you before benodige ShSh files on time have beaten using TinyUmbrella (Linux, Mac OS X and Windows).

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