While I'm no expert, my understanding is that if your Maxx has been updated to Kit Kat and it was never rooted when it had Jelly Bean then there is no current solution which will allow you to obtain root. What's worse is that based on the commentary in the following thread many people believe that there will never be a root solution for a Maxx with Kit Kat that wasn't rooted when it had Jelly Bean. Here's a link to the thread - click here
Additionally, it's my understanding that a Factory Reset will not solve your problem. Once a Maxx has been upgraded to Kit Kat there's no going back to Jelly Bean.
Yep. If it is on 4.4, there is no way to root it and no way back to 4.2.2.