My Samsung S4 (Model SGH-I337M) has recently been updated from 4.3 to 4.4.2, and everything has gone to sh*t since; my battery life has decreased significantly, basic apps such as the camera lag, even just trying to turn on the screen sometimes takes several tries and my phone freezes. Overall everything runs slower. Is there a simple way to downgrade back to the previous version of the OS without rooting my phone and/or voiding the warranty? What I was running before: Android Version: 4.3 Kernel version: 3.4.0-2142508 Build number: JSS15J.I337MVLUEMK6 What I'm running now: Android Version: 4.4.2 Kernel version: 3.4.0-880525 Build number: KOT49H.I337MVLUFNC1 Thanks!!