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  1. C

    Ipad 4.2.1 update unknown error

    I had been trying to update my jailbroken ipad running on 3.2.2 to 4.2.1 for a few weeks now. I have downloaded the ipsw file and tried updating the ipad using shift+update multiple times. I keep getting the error message after verifying my ipad: The iPad "****" cannot be updated, an unknown...