IPhone 3gs not updating to iOS5

iPhone 3gs is on 4.1 and im trying to update to ios 5, i have the latest version of itunes, the errors i get are errors 21,1600, and 2005. I tried putting my phone in dfu mode as well I dont know what do do, please help.

Is your phone jailbroken? Was it ever jailbroken in the past? These errors are generally associated with jailbroken phones. If it is not and has never been, it may indicate a hardware failure.

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