Go here to learn how to properly upgrade your phone to Kit Kat -> http://www.droidrzr.com/index.php/to...a/#entry433486
This provides links to all the tools/software you need to get your phone upgraded to Kit Kat. Remember, he is also assuming you want to downgrade back to a previous version of JB so you can take the OTA. In your case, you might want to follow his directions to get yourself back to full stock, unrooted. Just uninstalling root alone won't help. You basically have to reimage your phone using this process back to a stock JB before taking the OTA.
The OTA is very picky about any modifications that might have been done to the phone (freezing apps, rooting, etc). SamuriHL's process will ensure your phone is back to stock just like it was out of the box when you first got your phone and that should provide you with a clean path to upgrade to Kit Kat on the RAZR HD or RAZR MAXX HD.