I cannot activate or restore my iPhone 4S. Help?
I had an iPhone 4, but I bought a 4S recently as I wished to upgrade. I noticed a rattling noise when the phone vibrated and took it to an Apple Store about a week after I got it from eBay. They apparently took the back off and had a look and found nothing wrong. This vibration annoyed me, so I put my SIM back in my old iPhone 4.
I've been trying to restore my 4S so I can sell it, but a series of error messages keep coming up. When the phone is connected to the computer it says "the software has expired and must be updated to a newer version." However the iPhone had iOS 6 on it from the moment I got it, and still does. The computer then proceeds to sync, but states "cannot sync apps because the apps installed could not be determined". Finally when I attempt to restore it says "There was a problem downloading the software for iPhone. The requested resource was not found."
Now, I put the SIM back into the 4S - which worked fine a week ago. However now it is stuck on an activation screen. It asks which wireless signal it should connect to, then attempts to activate, then inevitably coming up with "Could not activate iPhone. The activation server is temporarily unavailable."
What do I need to do in order to get back into my iPhone and restore it to factory settings?
iPhone 4S, iOS 6