Hello, I had an iPhone 4 running iOS 5 beta 7 and sold it to Dough Dough for £277.04. They received it and connected it to iTunes to restore. When they connect it into iTunes they say an error 1604 is shown and it is stuck in recovery. Therefore they say it is FAULTY (bollocks) and want to pay me the faulty price (£140). Can someone please tell me how to fix error 1604?