HiI have SgH-i317 it is unlocked and rooted. But Knox warranty void 1. means that in cant downgrade to factory rom. I just want to ask expert what precation i should take so i can't brick my phone. also i want to use t-mobile and want to use wifi calling feature i installed and tried jedi master x2 rom and select t-mobile i successfully install rom. but since i dont have any t-mobile sim yet can't check wifi calling feature but with my att sim i keep losing signal in every 2-3 minutes and get signal right back in 10 second but call is dropping as signal get lost.
so can some one direct me right direction so i can utilize this feature when i buy t-mobile sim
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