Just in case anyone else read this thread and finds him/herself in the same situation that i was, a little tutorial:
Make sure you're in firmware NE3, I have a SGH-i537 AT&T Model, haven't tried with 9295 or other model.
Root your device, I used ...
I bought this phone almost a month ago for my daughter, and SIM unlocked it last friday. Everything is fine on that regard. I rooted it with towelroot, installed SafeStrap 3.73 and so far, so good. I'm on NE3 firmware, so In order to other TW-base...
Waiting for windows 10 to reach the M8 before i get started on this
Only thing I miss is the slow motion camera