Short history: Rooted 4.2 a while back, but the speakers stopped working (constant headphone mode) so I thought a software update was finally in order. Did the 4.3 update (not knowing about Knox) to see if that fixed the headphone issue (it didn't) then installed TWRP and tried to install the 4.4 OMNI nightly. After install, it hangs on Samsung logo (soft brick?). Restored to backup, but still hangs. Tried installing SlimKat 4.4, but the install fails. Unsure where to go from here.
Phone still powers up, goes into both Download and Recovery mode. TWRP is the current bootloader(?)/recovery(?).
So, is there a simple reason I'm soft-bricked? I read that Knox is in the bootloader, so is it because I'm using TWRP that it hangs? I find it odd that after restoring to previous settings it still doesn't function. Also, I don't care about the warranty bit, so anything is on the table for me.
Much love to those who spend the time to help out, please link to any resources for me and others who have the same problem. I'll append the working solution to this post for quick access in the future!