Jailbroken iphone not updating?

On itunes i go to update to ios 6.1 and the step when it says checking iphone with apple it pauses a bit then an error message comes up saying unknow erreor has occurred i then pressed the restore and update button to unjailbreak my device but the same thing came up what should i do?

last time i updated my jailbroken device from ios 5.1.1 to ios 6.0.1 it worked perfectly fine and there was no apple identification step.

I had the exact same problem, in iTunes, click restore iphone, then restore and update.

Make sure itunes is updated.
do a restore and update.
backup, make sure no passcode.
i did it with my ipad mini and it wrks perfect.
made a vid to its only about 3min long and works.

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