I am fairly new to the Android system. I have unfortunately accepted the 4.4.2 update so I believe rooting is out of question for now. However, the phone seems to be loosing battery power too fast now after the update and there is a constant "message expired or not available" pop-up message in the lower section of the screen. The phone works well in the safe mode. So I assume there was something wrong with the update.
I feel like it would be good to update again to a clean version of rom, debloated of the ATT stuff, I just want the phone to work well and I do use the S-apps from samsung so I want those. How do I do it?