The good folks at Team Android posted an article on upgrading your Samsung Galaxy Note 3 B900.
To Remember:
-This tutorial is only for installing C-RoM Android 4.4.4 ROM on Samsung Galaxy Note 3 N900. Please do not try on any other Galaxy Note 3 variants.
-Your phone should be rooted and have ClockworkMod recovery installed from before.
-This tutorial will wipe out all your data. Proceed at your own risk.
-Perform a Dalvik Cache wipe before proceeding from the recovery mode.
-Samsung KIES will NOT detect your phone after installing this ROM because it is a customfirmware.
-Make sure you backup all your data in your phone before proceeding.