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Try a restore and then update. If that doesnt work, the try DFU mode and then restore. You will lose your JB if you update.
I'm aware of losing JB, but for the last two days, I have been unable to use my phone without it freezing.
My iphone is now stuck in DFU Mode, the one where it shows the symbol to connect to itunes. Can someone please advise.
Thanks for all your help. I was able to finally upgrade.