My iPhone 4s was jailbroken and I updated to the ios 6?

I had no idea that my iPhone was jailbroken since I bought it from my dad's friend and now it's stuck in recovery mode and I tried iTunes to restore it but it won't work what do I do?

Click the power and home botton acouple of times to force out… Or you can put it again in DFU mode completely its maybe just on brick not recovery.

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