Update software in iPhone 3Gs

The iPhone"iPhone" could not be restored. An unknown error occured(1015). This is message i got from my PC after i tried to update my iphone and it failed. Any ideas to fix it, pls???

It depends on the iOS version currently installed.
iOS 4: Updating your device to iOS 5 or later
Summary: Connect your iPhone to a computer running the latest version of iTunes and your update options will appear.

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