[Galaxy Note 8.0 (Tablet) General] Slipurson:
I installed 4.2.2 (N5120XXCMG7) with the help of Mobile Odin,

But if you are on 4.1.2 and no Root this is how you get 4.2.2 and Root in just 34 easy steps :p

This will be for GT-N5120 the LTE version only.

READ THE WHOLE THING ONCE BEFORE YOU START!

Also thanks to Chainfire, Sammobile and Clockworkmod

All this was done with Windows 8.1, no compatibility-mode for Odin or anything like that

If you are already on a rooted 4.1.2, you could start at step 14. (or step 22 if you dont need to do a nand-backup)

00. Firstly download the firmware from Sammobile, this takes some time if you do not have an hotfileaccount so do this first

01. Download

Chainfire's

CF-Auto-Root-konalte-konaltexx-gtn5120.zip with included Odin (Here)

02. Download

Clockworkmod's

CWM Recovery (here) This will be used to make a backup of your Note 8.0

03. Download Odin 3.07 (from here)

04. Install Samsungs USB-drivers (found here)

05. Unpack the CF-Auto-Root-konalte-konaltexx-gtn5120.zip-file somewhere on your computer, so that you can find the files easily.

06. Turn off your Note 8 and start it with holding volume down and power to get to download mode.

07. Press Volume Up to get start download mode, and connect the USB-Cable to your computer, let the drivers install

08. Start Odin 1.85 from the folder where you extraced the CF-Auto-Root-konalte-konaltexx-gtn5120.zip.

09. When the Square at ID:COM say something like 0:[COM7] on a yellow background and Messagebox says ADDED!! you are good to go.

10. Click on the PDA button and browse for the file 5. CF-Auto-Root-konalte-konaltexx-gtn5120.tar.md5 (.md5 might not be visible to you)

11. Now click Start and wait for Odin to flash rooted kernel and reboot your device.

12. You now have a rooted 4.1.2-device

13. Close Odin on your computer

14. Shut down and start the Note in Download mode again (volume down and power, then volume up)

15. Unpack Odin3.07.zip to some good place on your computer

16. Start Odin 3.07 and connect your Note to the computer

17. Click the PDA button and choose the RecoveryCWM6.03.2-GT-N5120.tar-file you downloaded earlier.

18. Click Start and wait for Odin to flash recovery, then reboot your Note 8.0

19. Shut down and unplug the Note.

20. Start the Note into recoverymode by holding Volume Up and then pressing power until it boots,

21. Once in recovery, choose backup and restore and then backup to external SD-Card (if possible, else backup to internal)

22. When backup is done (might take some time), reboot the Note, go to playstore and buy Odin (there is a free version here on XDA)

23. Plug in the Note to the computer and unpack and copy the 4.2.2 firmware to SD-Card.

24. Optionally you could here install Titanium Backup or Helium to backup your apps and games since i suggest you wipe your data later. If you dont have any progress you want to save then you could skip this step.

25. Start Mobile Odin, accept root-permission and let it download the flashkernel.

26. When Mobile Odin is done downloading, select Open file..

27. Select external, browse to and select the 4.2.2 frimware (N5120XXCMG7)

28. I suggest that, if you do not live in the UK, touch the Modem-selection in Mobile Odin and choose Clear to not flash the new modem (for me LTE didnt work when i flashed the new modem)

29. Make sure Enable Everroot, Inject SuperUser and Inject Mobile odin are selected.

30. I suggest you also check Wipe Data/Cache and Wipe Dalvik also (this deletes all your data on the device)

31. Touch Flash and to make sure the downloaded file is correct, let it do the MD5-check

32. Let Mobile Odin work (will reboot twice) and you should soon be booted and get to do the setup of your new and improved Note 8.0 with 4.2.2 in all its Samsungy Glory :)

33. If you do not like the bloatware from samsung, just install Titanium Backup and Freeze any unwanted applications.

The backup we did earlier with CWM Recovery, needs a Working CWM for 4.2.2 incase you want to revert back to 4.1.2. I am not sure if the CWM-Recovery we downloaded earlier works with 4.2.2 as i havnt tested (i havnt done any backup even tho i tell everyone to do so).