Hello I have a rooted S4 i used kingo root app from a computer to root my S4 it was my first time rooting any android as I am new to android os I am familiar with apple and jailbreaking i like android much better, that's why I switched so I want to get the new 4.4.2 update from AT&T but everytime i try it says installation failed and I don't know how to put my stock firmware back on, I'm pretty much stock but I deleted bloat ware and stuff like that when my s4 boots up it says custom under the samsung logo please help I just want to update ?