Default [Q] S4 on 4.3

Hi People
Sorry if this has been asked before but I've been searching for an answer
I bought a brand new S4 from a phone shop today
got it home and realised it was a German Vodafone model which is unlocked but is on 4.3 with some apps I cant remove
Knox has not been installed so is it possible to debrand using Odin ?????
I just read about Knox being activated to 0x1???
any help would be great
thanks in advance