Sorry in advance if this has already been covered but I have made numerous Google and forum searches with no luck. I have had a lot of trouble setting up iOS 5 on my iphone 4 for GSM. My UDID is registered, tinyumbrella backup up my shsh blobs, I removed the listings for gs.apple.com from my hosts file along with the one for cydia, installed iTunes 10.5, turned off firewall, and plugged directly into my cable modem. I dont use a jailbreak. After all that I still get the error 14 on my phone. I have tried all the USB ports on my macbook pro with no luck. The only guides to fixing error 14 is for people running windows. Can anyone help? I have had to restore to 4.3.3 on wed. night and restore from backup. I might try setting up iOS 5 this weekend since i dont have much to lose but time. Thanks everyone.