[G Pad 8.3 General] roirraW "edor" ehT:
Thanks to [MENTION=4534004]JBurch/cry[/MENTION] for the monetary motivation to finally put this all together in one place!

There are THREE variants of the G Pad 8.3: The Verizon VK810.4G which has LTE, and the V500 and V510 WIFI-only models. These instructions are ONLY for the VK810.4G.

Please don't quote the whole OP.

FAQ: If you use files meant for anything else other than the VK810, you'll brick your tablet. This will be exhibited by the tablet showing up in Windows' Device Manager under "Other devices" as "QHSUSB-BULK". You will have to Google for "QHSUSB-BULK" to find out how to fix that. I've read about some having success doing so and others not. I haven't ever had to fix that so I have no personal experience with it and can only lead you to Google about it.

This requires a Windows PC, preferably Windows 7 or newer, to first downgrade your VK810 variant of the G Pad 8.3 to LG build 11A / Jellybean 4.4.2, to make it easiest to root and to put a custom recovery on.

Disclaimer: I am not responsible for whatever you do to your device. This is my preferred method and what I recommend.

Note: These instructions are still working in order to downgrade from official stock release 36B on the VK810 (codename "altev"), Verizon LG G Pad 8.3 LTE, to official stock release 11A in order to make it easiest to both root and install TWRP. You can then install any ROM you like including my newest stock ROM in my signature at the bottom of this post.

Downgrading/resetting to 100% official stock unrooted release 11A (11A is chosen for two reasons: 1. because it's easiest to root with the Stump app and 2. because on anything newer than 11A, you'd have to manually downgrade the bootloader before being able to install TWRP the first time):

1. On a Windows PC, preferably with Windows 7 or higher, download the latest Verizon-LG driver at http://www.lg.com/us/support-mobile/lg-LGVK810 (current version 4.0.3, direct download link if still working http://18d5a.wpc.azureedge.net/8018D5A/tool/dn/downloader.dev?fileKey=UW00520120427).

2. Install the driver.

3. Reboot the PC.

4. While you're continuing to follow the rest of the directions, might as well get the installed driver "loaded":

4A. Put the VK810 in Download mode:

4A1. Preferably using the original USB cable, or alternatively possibly a high-quality cable, connect the one end preferably to a USB 2.0 port on your Windows PC. Note: not all, but most USB 3.0 ports (to avoid for this process under normal circumstances) are blue in color whereas USB 2.0 ports are usually black.

4A2. Turn the VK810 off (within Android, long press the power button and choose "Power off").

4A3. The following is different from other G Pad 8.3 variants:

4A3a. Press and hold the Up Volume button.

4A3b. While continuing to hold it, insert the tablet end of the USB cable.

4A3c. You should feel the tablet vibrate and you can see a very dim, very faint graphic in the very center of the screen that says "Download Mode":

Credit and thanks [MENTION=5903478]sevoan[/MENTION] for posting the screenshot at http://xdaforums.com/showthread.php?t=2782066

4A3d. Let go of the Up Volume button.​

4B. Windows may take up to 10 minutes to finish loading the driver you previously installed. Every time you connect any USB device to a new/different USB port on a PC, Windows will have to take a longer loading the driver process.​

5. Download the official stock release 11A KDZ for the VK810: https://www.androidfilehost.com/?fid=23991606952610809 (file name "5. VK81011A_01 - Jellybean 4.2.2.KDZ - MD5 hash inside - recommended for both ease of rooting and one less step to install the initial TWRP v2.7.0.1.7z")

If the previous link doesn't work, you can find it in my signature at the bottom of this post.

6. Download and install the free 7-Zip Windows program from ttp://www.7-zip.org"]http://www.7-zip.org[/URL]. Any version should work although you can only install the 64-bit version on 64-bit versions of Windows.

7. Use 7-Zip to extract the KDZ from the 7-Zip (7z) file downloaded in step 5 above. If you want to extract the 7-Zip on an Android device instead for some reason, use ZArchiver from the Play Store at https://play.google.com/store/apps/details?id=ru.zdevs.zarchiver&hl=en

8. LG Flash Tool 2014:

8A. On the Windows PC, download "LG Flash Tool 2014" from http://xdaforums.com/showthread.php?t=2797190

Credit and thanks [MENTION=2181463]quangnhut123[/MENTION]

The MediaFire link is in step "3. Tutorial"

8B. Run "LGFlashTool2014.exe" as Admin: Right-click on "LGFlashTool2014.exe" and choose "Run as administrator". Provide Administrator credentials if necessary. If you get a UAC (User Account Control) prompt, click "Yes".

8C. If the program doesn't run, install the Visual C++ Runtime Library, also available in step "3. Tutorial" at the link in step 8 above, then repeat step 9.

8D. Screenshots also available at the link in step 8.

8E. "Select Type" should already be at the correct default "CDMA". Same for "PhoneMode" is "DIAG" and "Reset time" is "33000".

8F. Click the yellow folder icon to the right of the "Select KDZ file" field and choose the 11A KDZ file extracted from the 7-Zip archive you downloaded in step 5 above.

For reference: "CSE Flash" is what you should normally always use. "CSE Flash" will wipe your user data including your internal storage so be sure to move/copy anything you want to keep that's currently on your internal storage. "Normal Flash" is like a dirty flash. Your device will be restored completely to stock but will keep all of your user data including your internal storage. If you're downgrading stock ROM versions, you can expect "Normal" to result in a device that'll crash. If you do so, you can attempt a "Factory Reset" from the stock recovery (with the device off - long press the power button for 10 or so seconds until the device shuts off - press and hold the Down Volume button. While continuing to hold the Down Volume button, press and hold the Power Button. The screen should come on in the stock recovery and you can let go of both buttons). "Factory Reset" will of course wipe all user data including Internal Storage.

8G. Click "CSE Flash".

8H. On the "Read Phone Information" dialog which appears, do NOT press the "Read Phone Information" button. This has always crashed for me.

8I. Click "Start".

8J. On the next dialog, you can change the Country and Language if you like - either way doesn't make a difference. Click "OK".

VERY IMPORTANT: Once you click "OK", ignore any error dialogs that pop up. I mean every single one. Don't click any buttons in them, just drag them out of your way if necessary. 99.9% of the time, given enough time the device will be flashed successfully anyway. On the VK810, usually within 20 minutes. For comparison, on the VS985 Verizon LG G3, usually within 10 minutes.​

Rooting VK810 official stock release 11A (11A is chosen for two reasons: 1. because it's easiest to root with the Stump app and 2. because on anything newer than 11A, you'd have to manually downgrade the bootloader before being able to install TWRP the first time):

http://xdaforums.com/showpost.php?p=64577888&postcount=2

Installing the initial (necessary) TWRP v2.7.0.1 and updating it to the latest TWRP v2.8.7.0:

http://xdaforums.com/showpost.php?p=64577888&postcount=3

Flash to the latest stock ROM so that you can have it with root:

http://xdaforums.com/showpost.php?p=64601845&postcount=4

In order to get back into TWRP/custom recovery from rooted Lollipop or above ROMs:

http://xdaforums.com/showpost.php?p=64601845&postcount=5

General thanks to, for my previous experience:

[MENTION=2645378]AndroidFileHost[/MENTION] for the Android File Host website and especially their changes allowing for the reorganization of already uploaded files.

[MENTION=5418208]KyPbP[/MENTION] for letting us know it's availability and giving the link to download the VK810 35A_08 KDZ. http://xdaforums.com/showpost.php?p=60851710&postcount=108

[MENTION=5713365]Revoe[/MENTION] for letting us know the availability of the VK810 36B_00 OTA. http://xdaforums.com/lg-g-pad-83/general/verizon-lg-g-pad-8-3-vk810-altev-ota-t3182449

[MENTION=5868929]hsbadr[/MENTION] for giving me permission to kang his Verizon G3 VS985 JasmineROM 7.0 update script for this use. http://xdaforums.com/showpost.php?p=56005236&postcount=1

[MENTION=229404]rant[/MENTION] for giving a link to the official Verizon PDF detailing 35B. http://xdaforums.com/showpost.php?p=60857092&postcount=1 http://www.verizonwireless.com/dam/support/pdf/system_update/benefits-lg-g-pad-83-5-20-15.pdf

[MENTION=4031599]DeanGibson[/MENTION] for giving a link to the official Verizon PDF detailing this release. http://xdaforums.com/showpost.php?p=62413430&postcount=2 http://www.verizonwireless.com/dam/support/pdf/system_update/benefits-lg-gpad-83-8-17-15.pdf

[MENTION=631273]Chainfire[/MENTION] for SuperSU! http://xdaforums.com/showthread.php?t=1538053

[MENTION=5022682]Hnk1[/MENTION] for continued support, advise and ideas, and for experimenting to find out how to root 35A_08 without downgrading.

[MENTION=2941286]xdabbeb[/MENTION] for further knowledge about the partitions!