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Apple Locked Digital Signatures in iTunes for iOS 4.2.1

Apple has locked digital signatures in iTunes for iOS 4.2.1 users preventing all those folks who have not saved SHSH blobs on their devices to update or repair to this firmware version, forcing users to install Apple’s new operating system iOS 4.3 right now.

If you did not saved SHSH blobs, don’t attempt to carry out any process to jailbreak or unlock your devices since it can turn very dicey for you, as you could be forced to update your devices to new iOS 4.3 firmware.

However, if you have saved the SHSH blobs via Cydia or TinyUmbrella, you are free to downgrade to 4.2.1 using iOS through our tutorials in jailbreak category. To avoid the same problem in future we recommend all of iPhone users to start saving their SHSH and for this purpose you can use TinyUmbrella.

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