I was trying to update my not-jailbroken iPhone 4 to 4.3.1 and it didn't work. I got an error message and the phone had the connect to iTunes message. I tried to restore and there was another failure. I tried to restore again and now it seems to just be frozen. I don't want to disconnect or force quit iTunes for fear of doing more harm, but what should I do? The progress bar has been frozen in the same spot for 15 minutes now.