[LG G Pad X 8.0 Guides, News, & Discussion] mingkee:
Update:

Update to 7.0 and dirty cow root can be found there.

https://xdaforums.com/lg-g-pad-83/development/nougat-7-0-v521-guide-to-update-v521-lg-t3533338

Latest dll for LGUP

https://www.androidfilehost.com/?fid=745425885120701290

Make sure you use upgrade

It's highly recommend to update to 7.0

Thanks [MENTION=4965298]tungkick[/MENTION] for making rooted .dz file

Download: https://drive.google.com/file/d/0BwLkiuDnHmY0bTBsOG12VnBOa3c/view?usp=sharing

LGUP: http://xdaforums.com/g4/help/lgup-install-kdz-mm-lp-t3249803

Install LG Bridge for required drivers.

Download this .dll file https://www.androidfilehost.com/?fid=24588232905722773 Rename LGUP_c.dll to LGUP_common.dll

After installed LGUP, go to C:\Program Files (x86)\LG Electronics\LGUP\model (you must login as administrator)

add new folder \common\ and put dll file there

Make sure you backup the machine with LG Backup.

Unlock bootloader if you didn't do it with the following command in fastboot mode (adb reboot bootloader)

fastboot oem unlock

After finishing the prerequisite above, it's time to ROOT!

1. Plug your tablet to your host computer. If the battery is lower than 50%, please wait because the process may take up to 15 minutes.

2. Make sure USB is set to file transfer mode.

3. Open LGUP

4. Choose "upgrade" and locate downloaded .dz file. Press start when you're ready.

5. Wait about 15 minutes and it will finish.

(Optional) Update SuperSU binary if necessary.

---- edited version ----

Updated Instructions:

Prerequisites:

1. Download the following:

The .dz File

Download LGUP following the instructions in the thread for installation.

Download LG Bridge for Windows PC for necessary device drivers or use the quick download

Download this .dll file https://www.androidfilehost.com/?fid=24588232905722773 - Rename LGUP_c.dll to LGUP_common.dll

2. After installing LGUP, go to C:\Program Files (x86)\LG Electronics\LGUP\model as an administrator and

add a new folder 'common' ("\common") and put the .dll file there

3. Backup the device with LG Backup.

4. Unlock the device bootloader if you haven't done so already.

reboot bootloader
fastboot oem unlock
fastboot reboot

5. Check if the bootloader is unlocked by entering:

fastboot getvar unlocked

After finishing the prerequisites above, it's time to ROOT!

1. Plug your tablet to your host computer. If the battery is lower than 50%, please wait because the process may take up to 15 minutes.

2. Set the USB to 'File Transfer Mode.'

3. Open LGUP and select the LG G Pad X 8.0

NOTE: If it doesn't appear, you may not be in 'File Transfer Mode,' missing device drivers, or have a faulty USB port or cable.​

4. Choose "Upgrade" and locate the downloaded .dz file. Press start when you're ready.

5. Wait about 15 minutes and it will finish. The process will hang for a bit at 99% or 100%, this is normal

6. Update SuperSU binary if necessary. (Optional)

You can also revert to stock or unroot when desired

1. Use LGUP and flash the stock .dz

Special thanks to [MENTION=4965298]tungkick[/MENTION] for making the rooted .dz file. [MENTION=303482]mingkee[/MENTION], copy these newer instructions into your post, if desired, by quoting it and removing the quote tags.