I need help. I am trying to update my iPhone 5 to iOS 7 beta but keep on getting error on iTunes; "This device isn't compatible with the requested build" error. the UDID is registered on Apple's dev website using my brother's dev account. i"ve never jailbroken my iPhone and I tried to resolve the issue using the hosts trick but doesnt work still. I also tried restoring this phone on different Macs, still no luck Any ideas on might be causing this? anything would be much appreciated Thanks!!