If you take the time to read a couple of pages you'll see this thread isn't active anymore. Go here for recent modems/bootloaders: https://forum.xda-developers.com/galaxy-s4/general/ref-galaxy-s4-i9505-modems-bootloaders-t3315987gt-i9505 no sound how to fix it i tried a lot of diferent stock firmwares and modems i need help :3
But if you don't have sound , even with stock firmware, it sounds more like a hardware problem with your phone!