Default questions about KNOX void+ update


I have a S4 i9505. It's rooted and it runs a FoxHound rom 4.3 based.
Now that the new kitkat has officially come out, I would like to update to the official firmware using odin etc etc.
I looked up in download mode and I have 0x1 flag in KNOW WARRANTY VOID.
Now my question is: can I install from odin the official 4.3 firmware in this status? or will I get it unfunctional?

I don't know if this question is common or not, but, as I've seen a mess reguarding Knox troubles, I decided to ask directly.
Thanks a lot.