Post [Q] Galaxy S4 Active - downgrade?

This is my first Android phone i have owned for a few years now and i made the mistake of doing the OTA update to 4.3. I would love to root this phone because that was a big reason why i got it. I hated waiting for a jailbreak for my iPhone and i want a phone that i have control over. is it possible to "downgrade" from the OTA update to the leaked update? or even downgrade back to 4.2.2? I have looked around but cant find anything to helpful for the galaxy s4 active. also reading around multiple people say they end up having issues after downgrading or the KNOX counter going from 0x0 to 0x1, therefore voiding warranty.