原帖由： MaxAwesomeness GB (Max) ,
I had a full sized SCH-I545 (S4). Either you tripped Knox and it won't let you update, or the Root you used disabled updates so you wouldn't brick your phone. What I did was I plugged it into my PC and used a ROM program to flash the stock rom back on. If that does not work, try using KIES (You might have to try 2 or 3 to see which works with your phone. Mine used KIES 2). It is the iTunes of SAMSUNG in a way.