Hi, so my dad has a T-Mobile S3, and in 2012 i flashed it 4.1.2 AOKP rom, and now i want to update it to the latest touchwiz or something. However i seen some rom threads saying you need a 4.3 bootloader and this and that. How would i go about updating this phone? I'm not a noob at flashing or anything lol. Just dont have much experience with this device and rather not have it be a paperweight. Just need simple directions.