Can't update my iPhone 4 to ios5 it says unknown error (-1)

im using macbook, i installed the latest version of itunes after updating my iphone4 to ios 5, after few minutes suddenly popup unknown error (-1). i dont know why. i try DFU mode but didnt work, i did it 10 times but still error. am stuck in recovery mode.
anyone please help me.

I have the same problem, i´ve tried several times to update, was you iphone jailbreaken aswell?
Im searching and searching but no result.. please let me know if you solve it. I have a PC, also tried downgrading and install ios5 with redsn0w but then I only get the "no sim card found" problem. Mine is not unlocked by the carrier.
/F

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