I have a similar question,
I have an S4 with OmegaRom, Knox has been tripped and I want to update and wipe clean to sell.
Do I need to flash the same rom that the Omega one was based upon? (I.E XXUFNC9) Or will any stock 4.4.2 rom work? As I'd like the use the latest BTU one, which is only XXUFNB8
Once I've flashed stock, I undersrtand the KNOX apps won't work again, but will the device still be updatable through OTA and KIES?