Ah, I have never heard of this KNOX thingy before (simply because I have never owned any Samsung devices...), but now as I googled it it seems to be more or less the equivalent of Harmattan Closed Mode, right?

Except that it seems to be not possible to get back to the default mode (Closed Mode equivqlent) by reflashing complete firmware or something like that...?

What is the difference in devices runnig with KNOX=0x0 vs. KNOX=0x1 ??