I've got a problems with my Iphone 4, I've recently upgraded to the new software (5.1), since then the iTunes doesn't recognize my iphone, as the error comes up:' iTunes could not connect to this iPhone because an unknown error (ex8000

I've recently upgraded to the new software (5.1), since then the iTunes doesn't recognize my iphone, as the error comes up:' iTunes could not connect to this iPhone because an unknown error (ex8000022).
Are you guys facing the same problem?
Let me know your opinions, solutions and even problems.
Thank You !
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http://support.apple.com/kb/HT4137
How to restore as new.
and this for itunes message
http://support.apple.com/kb/HT1808