Ok, so I followed the sticky guide for returning to stock. I was using CM 10.2 or whatever it was. I flashed the stock firmware using Odin and got it all back to stock and it works fine, other than the OTA update. When I did an OTA check it said I have the newest firmware and Kies says the same thing. Is there any way to update the phone further? I want to sell it but I don't want someone else to have to figure this out. Thank you.