Samsung Galaxy Note 10.1 2014 Edition LTE (SM-P605K) Firmware Overview
What is the latest SM-P605K firmware?
P605KKTUCQA2, released January 20, 2017 with Android 4.4.2. The archive holds 2 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Note 10.1 2014 Edition LTE still getting updates?
Most likely not: there has been no new firmware since January 2017, so Android 4.4.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All SM-P605K firmware builds
How to Flash SM-P605K Firmware
Put the Samsung Galaxy Note 10.1 2014 Edition LTE into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Use HOME_CSC to keep your data, CSC for a full wipe.