My iPad 3 screen would go blank after updating to iOS7.0. (after using for a few minutes) Screen then comes back on when I upgraded to iOS 7.0.2 (full download, not delta)... but again, goes blank after a few minutes of use. I took the iPad to the Apple Store and the genius said they'll do a factory restore. Now the iPad works fine. He said that when they do download/restore with their in-house servers, it's actually very different than what the public can do. He said when they do this, it can also restore the "firmware" of the devices. Is this true?