My iphone 4 keeps freezing on the back up stage of updating it to IOS 5 ... HELP!

It downloaded all ok but everytime i try to update my iphone 4 it freezes on the backing up stage, any ideas?

Possible, but not 100% sealproof. -1 can happen in a variety of situations, not always jailbroken. It's a baseband error and while the risk of getting that error is higher on a non-factory unlocked device, it can still happen.
Even if OP was jailbroken and removed the jailbreak, it's quite difficult, if not impossible to tell the device has been jailbroken before if restored as brand new.
Take the device to an Apple Store for evaluation.

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