[G Pad 8.3 Q&A, Help & Troubleshooting] johnseidel:
Well, I gave it one more try, but got the same "music" and "camera" errors.

Oddly cm12 always opened to the home page instead of the lock screen. Then the errors come, and then the screen starts flashing, and then the tablet locks up.

Below I've listed links to all the tools and apps I used in this process. My list needs better annotations and some revisions. But it could serve as a resource for other community members. I'm going to step back from this for a couple of days before I clean and edit this list. Any additions, edits, or corrections would be welcomed.

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Tools I needed to Flash CM-12.

I had to chase all over XDA forums and threads to find these tools. Thanks to Deltadroid who pointed me to several of these links. I have decided to list them in a single post so they are easier to locate. You may not need to use all of these.

For convenience you may want to create a folder called GPad Tools on your computer where you can put things that you download to your computer.

Original_LG_Firmware

http://xdaforums.com/showthread.php?t=1073827

* Download this program to your computer.

* It lets you download the flashable stock 4.4.2 rom, v50020d_00.kdz, to your Computer.

* To download the v50020d_00.kdz, you will need your SN. It is on the back of the gpad, at the bottom, in very tiny print. It is also on a sticker on the box the gpad came in.

* Store a backup copy of v52002d_00.kdz in case it gets deleted in the flashing process.

LG Flash Tool 2014

http://xdaforums.com/showthread.php?t=2797190

* Download this program to your computer.

* The LG Flash Tool 2014 lets you flash v50020d_00.kdz to your tablet using a usb cable.

* Before you flash. put a copy of v50020d_00.kdz in the same folder as lgflashtool2014.exe.

IORoot25

http://xdaforums.com/showthread.php?t=2703825

* Download this program to your computer.

* IORoot25 lets you root the v50020d.kdz that you have flashed to your computer. (I had problems with Stump. Otherwise I love Stump.)

loki-exploitable ABOOT and TWRP

http://xdaforums.com/showthread.php?t=2698267

* Download this to your computer.

* It puts a loki friendly aboot.img on your tablet. This is necessary to put a loki friendly TWRP image on your tablet

* (Scroll down to Step 3 on this page for the link)

loki friendly TWRP Openrecovery Image

http://xdaforums.com/lg-g-pad-83/orig-development/recovery-twrp-2-8-2-0-v500-t2968472

* Download this to your Tablet. (I store mine on the External SD in a CM Files folder.)

* This is a loki friendly, v500 friendly TWRP image by Rick Roll.

* (Other versions of TWRP, which are not modified by Rick Roll, produce flashing errors. They see the tablet as "palman" instead of "v500" and abort flashing the rom, and other apps.)

Get Flashify, SuperSU, and Quick Reboot from the Play Store

1. Run SuperSU

2. Run Flashify-

* tap Recovery Image

* tap Choose a File (Do not select "Download TWRP".)

* Choose a File Manager

* Navigate to the TWRP Openrecovery image stored on your tablet, select it and install it.

3. Quick Reboot- is just for convenience, it simplifies reboot into recovery (eliminates power button, volume button gymnastics). (There are several similar apps. This is the one I like.)

You should now be set to flash Cyanogenmod cm12 rom nightlies by Deltadroid

http://xdaforums.com/lg-g-pad-83/development/rom-official-cyanogenmod-12-t3026647.