I had an iPhone version 8.4 that went bad with the bubbling screen, so I sent it for a replacement, and I recieved an iOS 7.x phone. I restored my old phone, and then when I went to restore my new phone I had to set it up as a new device, and upgrade it to 8.4. Once the new iPhone was upgraded to iOS 8.4, I tried to restore with no luck. This video is about what I learned, and wanted to share about what iTunes did, when I (1) setup the phone as a new phone (2) and what iTunes defaults the settings to. Hopefully, if you are not able to restore your phone, you will find this video to be helpful in diagnosing your own problems, and be able to get your phone to restore properly.