Here is a quick guide for those who need to return to Stock. This has been tested on my LG Pad 7.0, which I was customizing after rooting, and something went wrong. I took a couple of hours trying to get an official copy of the stock firmware, and once I got my device back up and running decided to post a guide for future reference.

Keep in mind that this replaces all the system files on the tablet that might have been removed, modified, or replaced. Please MAKE A BACKUP OF YOUR PICTURES, MUSIC, OR DOCUMENTS.

Quick disclaimer though, I’m not responsible if you tablet somehow freaks out, and cannot be used anymore, but the likeliness of this happening is about as likely as you winning the lottery, so if it does, you might want to buy a lottery ticket.
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STEP ONE
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Download the following files below:

LG Driver
LG Tools 2014
LG Firmware

Rooted LG Firmware

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STEP TWO
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Install the LG Driver onto your computer, then reboot.

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STEP THREE
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Extract the LG Tools 2014 FOLDER to your DESKTOP.

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STEP FOUR
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Move the FIRMWARE to the LG TOOLS 2014 FOLDER on your desktop. *Will make it easier to locate when needed*

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STEP FIVE
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TURN OFF your tablet! Plug your USB WIRE into a USB slot on your machine. When it’s plugged in, hold on the Volume UP button on the tablet and at the same time plug in the USB wire. Hold onto the volume button until you see the follow:

LG-G2-DownloadMode

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STEP SIX
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OPEN the LG Tools Folder, you should have the following:

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Click on the LGFLASHTOOL2014 file. Then you should see this:

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You need to make sure that the Select Type is 3GQCT, and the PhoneMode is EMERGENCY. Also, Select the KDZ file (Firmware) that you placed in the the LG Tools 2014 folder. Then Press Normal Flash.

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This should popup right after, and you just need to click start. Then another thing (below) should pop up.

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Just click OK Reason why is that your device will use English as it’s default regardless. Now once you see this (below) sit back and wait. Shouldn’t take no longer then 15 – 30 minutes.

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Congrats! Your device should be completely up and running again!