HT2404 i was try to upgrade my iphone 3gs via iTunes but it is not activate.what are the process to upgrade ? now it is showing black screen to select country then finally write unable to activate.

i was try to upgrade my iphone 3gs via iTunes but it is not activate.what are the process to upgrade ? now it is showing black screen to select country then finally write unable to activate.

Is there a sim in the iPhone?
Has the iPhone been jailbroken or modified to work with other
than the original wireless provider?
If you can get that far, what does it say when you look at
Settings=>General=>About=>Carrier?

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