Is a sim card required to restore iphone?

I bought a factory unlocked iphone and it was only on ios 4 so I went to restore it to ios 6 and now I can't restore it. It just says "no sim card installed" and if I try to restore it in itunes I get a 3194 error.So, do I have to have a sim card in the phone to be able to restore it?

Don't think so

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