My iphone 3gs won't restore to factory settings?

I bought an iphone 3gs for $50 from my friend, it worked fine except i had to restore it. It automatically updated the IOS but when it finishes restoring it gives me a message that says something like: "itunes could not restore your device due to an unknown error(-0)."

any idea on how i can fix it? Or does this mean my iphone is obsolete and will no longer work?

Put your iPhone in dfu mode and update it or restore it and it should work fine

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