Cannot restore iPhone 4 to iOS 5.0.1 9A405 unknown error (-1)

When I restore my iPHone 4 to iOS 5.0.1 9A405 it show that unknow error (-1) and it show at the 99.99% restore.
Please help me tell why?

thank you very much for your help. That was really helpfull!!! I downloaded a simple free app and all my apps now work!! I really appreciate..

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