Downgrading From iOS 7.0.2 to 6.1.3 on an iPhone 4S after window has closed?

I really despise iOS 7, and wish I can go back to 6.1.3. Any way to do this without jailbreaking? I really can't stand this battery-drainer.

Added (1). I already downloaded the firmware, and putting it on recovery mode and trying to restore will not work. (Error 3194)

I think all you would have to do is take it to a "repair center" and they should be able to do it for you

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