[LG G Pad X 8.0 Guides, News, & Discussion] JynxTheFierce:
Hi everyone! I just wanted to share my problems/solutions during my rooting adventures in the hopes it helps someone out.

First, the system I'm using is the free upgrade of Windows 10 Home (x64) version 1511, which has been out of date for sometime now. The only internet I have is my phone data, so any programs I need I download to my phone & then transfer via USB to my Laptop. Processor is 2.20GHz with 8 GB of RAM. The only reason I mention this is because of the hangups with the "logcat" command, so maybe you can determine how long it might take your system to finish the task.

OK, going on. I started by getting all the files from the instructions & saved them to a New Folder on the Desktop. I used the Minimal ADB Fastboot v1.3.1 program found in XDA, created an "adb" folder on C:\, and ran it from there. I copied the DirtyCow files & SuperSU zip to the C:\adb folder, leaving the Original Files in New Folder as a backup. I also got the LG Mobile drivers (by LG), the Universal ADB driver (by ClockworkMod), & Google's USB drivers. It's probably driver overkill, but for me it's better safe than sorry ;P

The first obstacle I had was trying to unlock the bootloader. I was able to issue adb commands, get to the bootloader, but couldn't do anything with Fastboot commands. To solve this I removed USB from the device & rebooted. While waiting for reboot, on PC opened up Device Manager. When reboot was complete, plugged USB back into device & ran command "usb devices" to verify it worked. Then I ran command "adb reboot bootloader". While in bootloader, went to Device Manager, found device & manually installed Google's Android Bootloader Interface driver from the driver list. Clicked "OK" on the warning dialogue, & when driver completed, switched to the Command Window & ran command "fastboot devices". It recognized my device & I unlocked the bootloader.

For PC flashing tools, I have LG Flash Tool & LG UP. For LG UP I installed the Uppercut program (cause the instructions say to) & added an Uppercut Icon Shortcut to the Desktop. At first, cause I'm a noob, I tried using the LG Flash Tool to flash the V52120f kdz file, which, I believe, gave me the blinking storage force close box. Using the command "adb reboot recovery" took me to the laid down Android Robot with the No Command text. I unplugged the USB from the device & while that screen was still showing, I pressed & held the Power Button for 1 second, then, while still holding Power, pressed the Volume Up button once, which took me to a new screen where I wiped the cache, data, & then powered down. While off, I removed the SIM Card (to skip some setup stuff) & Powered it on. After moving through setup, skipping everything I could, unlocked Developer Options, turned on USB Debugging, connected phone to PC & ran command "adb devices" to start running commands again.

This time I followed the instructions for flashing using LG UP, but started it using the Uppercut Shortcut. Everything went smooth & I proceeded onwards. Some of the commands took about a minute or so to complete. When I got to the "logcat" command, it took about 10 minutes to finally complete. After that, I completed the TWRP instructions & booted into TWRP. This is when I tried to make a backup but was unable to. The problem was storage showed 0mb, and unable to change storage options, which also showed 0mb. And sideloading SuperSU failed as well. The solution is the Format Button, not the Swipe Bar. The Format Button takes you to a screen were you must type "yes" to confirm. I did the Swipe Bar, which after going through setup and loading TWRP and pushing SuperSU again, still had both problems. After further reading, I saw the Format Button solution. I did that, did the setup/push/load TWRP thing, and still couldn't backup or sideload. My solution was to start from the Push instructions, complete the process, and when TWRP loaded, went straight to the Format Button. After that, I was able to sideload SuperSU and perform backups.

Sorry for the really long story, but I just wanted to be thorough. Hope this helps someone ^_^