need help with error code 1015 on iphone 3gs?

i have a iphone 3gs that was unlocked with 3. 0 firmware. when i tried to update it to the 3. 0. 1 firmware i keep on getting this error code 1015 on itunes every time i try to restore and update it. i tried everything i can find on google to fix it but it still wont work

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One Response to “need help with error code 1015 on iphone 3gs?”

  1. Follow this instructions in this link
    http://www. ihackintosh. com/2009/07/how-to-downgrade-os-31-beta-to-30/