Most of people upgrading to iOS 5.0 are getting this error “The iPhone could not be restored. An unknown error occurred (3200). or “The iPhone could not be upgrade. An unknown error occurred (3002). ”
iOS 5.0 has been release earlier today and Apple’s servers are swamped, and failing half the requests and thus resulting in this error.
We at iPhonestic have tried about 10 times but it was not successful. Some people are lucky enough to get through in couple of attempts.
It seems the whole world is upgrading to iOS 5.0 which speaks for the success of iOS 5.0 which is the biggest iPhone OS so far.
Some people are also getting different errors like the one below.
This has been also confirmed by saurik from his twitter feed.