Iphone 4 problem with activation

Hi, Got this iphone 4, it was working with 1.59 modem firmware and jailbreaked and unlocked. Got it factory unlocked from at&t and after i restore with 6.1.3 version can’t activate any more. Saying :We are sorry, we are unable to continue your activation at this time.(please try again later or contacts customer care). Even i tried with at&t sim too but same problem Any idea how to solve this?

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