Warning: This trips the Knox warranty void flag.
Download and extract the following files:
Power off your Android device.
Put the Galaxy Note Pro 12.2 LTE SM-P905 in Download Mode by pressing and holding down the Home, Volume Down buttons while pressing the Power button. A warning screen will come up; press Volume Up button to enter Download Mode. If you get a recovery menu instead, check that you are pressing the volume down button and not the volume up button.
Run Odin3 v3.09.exe as an Administrator because Admin privileges is required to complete the process smoothly
Connect your device to your PC using USB cable. You will see an “Added!!” massage in Odin’s message box.
Click the AP Button, and select that CF-Auto-Root-viennalte-viennaltexx-smp905.tar.md5 file
In Odin window, ensure only Auto Reboot and F. Reset Time checkboxes are selected.
Double check everything in Step 8 & 9 above. When satisfied click the START button to begin the flashing process.
Your device will restart and it is complete when you see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from computer.
If it worked, go to http://www.chainfire.eu/ and make a big donation for their work.