My girlfriend went full retard and installed the OTA 4.3 update for her S3. She uses Straight Talk, which works on the OTA 4.3 download. The only thing that doesn't work is 4G. She is stuck on edge. I think the best solution to getting 4G is to put a ROM on it BUT in order to do that I need to revert back to 4.2.1 or so. Any thoughts? I havent found anything on here that explains how to do so, but if I missed one please send me in the right direction.