Apple has announced the release of iOS 4.2.1 but along with another obstacle for unlockers and jailbreakers with the introduction of a baseband requirement for iOS starting from the newly released iOS 4.2.1. If you will try to restore 4.2.1 on an iPhone 4 then you will end up in recovery mode. So the unlockers and jailbreakers should stay on iOS 4.1.
According to Semaphore, the creator of TinyUmbrella program:
It seems that Apple has decided to put a baseband requirement on iOS. So at this point, if you are using Saurik’s server or tiny umbrella and trying to restore 4.2.1 on an iPhone 4, you will end up in recovery mode and tiny umbrella will not be able to pull you out of recovery. In this case, you will have to restore 4.1 again or you will have to restore 4.2.1 stock and be tether jailbroken. (Of course, I recommend 4.1 and not bothering with 4.2.1 at all). If you are an unlocker, this is a no brainer. Do not update to 4.2.1 even to test it at this point.
If you are relying on carrier unlock then this is another reason for you to stay away from iOS 4.2.1 and Redsn0w. Stay tuned with us for more updates.
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