Cant upgrade my iOS from 5.1.1 to 6.

im using iPhone 4s (Factory Unlock) but i Cant upgrade my iOS from 5.1.1 to 6. after 90% of download an error cameup and stop downloading. Tried several time to download, whats the problem ? what should i do ?

This message indicates that your phone was hacked or jailbroken to unlock it.
Then when you updated/restored your phone it locked back up to the original carrier.
Only the carrier that the phone is locked to can unlock it.

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