[Galaxy Note Pro 12.2 General] underlines:
Update Galaxy NotePRO 12.2 P900 to Android 5.0.2 Lollipop

(Not Tripping Knox)

Make sure you downloaded and installed the Samsung usb drivers beforehand (http://www.android.gs/download-samsung-usb-drivers-for-android/)

Download the firmware and extract it. ( http://samsung-updates.com/device/?id=SM-P900 or https://www.samdownloads.de/downloads/sm-p900/) (For USA users with tripped knox (no OTA update) just odin the "cellular south" SM-p900 5.0.2 sammobile rom.)

Download ODIN v3.09 (http://androidhost.org/PVAIv)

Reboot your phone into download mode. Do this by first switching off the phone, then pressing and holding the volume down + home button together and then pressing the power button. Press power again to enter download mode. (If you have problems go to the Troubleshoot section)

Open ODIN on your computer. You’ll see the ID:COM box turning yellow with a COM port number upon successful connection with the phone.

In ODIN click the AP button, select the extracted firmare file from step 2. It's a tar.md5 file

Make sure Auto Reboot & F. Reset Time options are selected in ODIN

Click on the start button. When the process is completed your phone will reboot. To confirm update Galaxy NotePRO 12.2 P900 to Android 5.0.2 official firmware simply check the settings > about.

How To Install TWRP + ROOT On Lollipop

(Tripping Knox)

Due To different bootloaders On Lollipop, installing TWRP is slightly different:

Download the twrp.tar (https://dl.twrp.me/v1awifi/twrp-2.8.7.0-v1awifi.img.tar.html) on your pc and supersu.zip (http://download.chainfire.eu/supersu) on your device. Also, download odin on your pc

Open odin on your pc.

Put device into download mode by turning off the tablet first. Then hold power,home, volume down button all at the same time till download mode comes up.

Hit volume up to continue

Connect tablet to pc.

Hit the ap or AP button in odin.

Select the twrp recovery tar.

Untick auto reboot in odin

Hit start and let it flash all the way

Now force reboot by holding power,home, volume up buttons at the same time till it reboots.

Hit install button in twrp.

Select the supersu zip you downloaded

Swipe to install and reboot.

Troubleshooting:

Q: Can't boot into TWRP

A: In ODIN, uncheck automatic reboot then flash TWRP. So you have enough time to get ready to reboot into TWRP directly after ODIN finishes.

After TWRP is flashed, press power+vol.up buttons and hold them until the Samsung Logo appears then release them.

You should then automatically go into TWRP. Once into TWRP, you can install the root.zip file.

Q: Lollipop is unstable, I get force closes or the whole ROM is just bull****!

A: Go to Recovery Mode by pressing and holding the Volume Up+Power buttons together.

Now, perform Wipe Data/Factory Reset and Wipe Cache Partition task before selecting the reboot system now option. In Recovery Mode use the Volume keys to navigate between options and Power key to select any option.

Q: Can't go into Download Mode

A: Actually on most devices, if you really press the three buttons constantly, it will reboot forever and not go into the download mode. It's better if you turn off your device completely, then press home, volume down. Keep them pressed. Now press the power button too. You're holding down all tree buttons now. The device boots about a second after you see the boot-logo, stop pressing the power button, but keep holding home and volume down. If it's not working try releasing the powerbutton earlier, or later than advised. But keep Home and Volume Down pressed constantly.

Q: Can't flash TWRP, it keeps booting into stock recovery!

A: Disable the Autoreboot option in ODIN