I have a galaxy S3 SGH i747, Jelly Bean 4.3. The update is downloaded but every time it attempts to update, it fails at 30%. What to do now?
Im sorry, i dont think there is any other option. The KitKat update for Galaxy S3 on AT&T is only downloadable via OTA (Over The Air). You cannot update for some unkown reason, that is, unless you are willing to FACTORY RESET your phone in order to be able to update.
(there is another VERY COMPLEX WAY on fixing this, it will involve ADB, Rooting, Putting your phone at risk, and voiding your warranty.... So i would not reccomend that, but tell me if you STILL want me to tell you the other way. But please note that you would be putting your phone at risk.)