iPhone stuck on restore screen
My phone is stuck on a screen that says "support.apple.com/iphone/restore. The screen has the iTunes logo and a pic of a connector pointing to the iTunes logo. I have plugged it in to iTunes several times. I keep getting a message in iTunes that the phone cannot be restored due to unknown error (9). When I try to chat or schedule a call with Apple support, it asks for the serial number of the phone, which I cannot get to because the phone is stuck on this screen. I can't update the software or do anything. It's just stuck on this screen. What do I do?