[G Pad 8.3 Q&A, Help & Troubleshooting] muiriddin:
Okay, my process from a fresh install of 4.4.2 is:

make sure to download everything you need before you start this process and read through it carefully... and realize you do this at your own risk, I will try to help, but this process can brick your device if done incorrectly...

1. Root device using stumproot, thread located here:

http://xdaforums.com/lg-g...rizon-t2850906

Other root approaches potentially will work as well, I use stump since it also works on my phone...

2. Download and use step 3 from idioterror's thread here:

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

You will need to modify his batch file to properly work the details for that are in the thread, the download by itself will not work without changing a line in the batch file (if I recall from memory find the query for 50010b and change it to 50010d.)

If that worked the batch file ends with an attempt to reboot into recovery. Unplug the cable after the batch file sends the reboot command so the adb reboot recovery command can properly complete and get you into recovery...

if the tablet boots back into stock try another adb reboot recovery manually(or use flashify to reboot into recovery), again unplug once the reboot starts.

If that does not get you into TWRP this step failed and youwill have to manually walk through what the batch file does... (manual instructions below, skip to them finish that and then come back here!).

Once you have this working recovery you need to decide which base you are going to use with your tablet, the 4.2.2. base (for AOSP based roms) or the 4.4.2 base (for recent stock based roms). The recoveries for the 4.2.2. and 4.4.2 are different see the details in this thread:

http://xdaforums.com/show....php?t=2551499

If you are going to run AOSP based roms skip to 3b...

3a. I am running a 4.4.2 base and a modified stock myself, I make sure to install the latest 2.8.0 recovery for the 4.4.2 base... You can now flash stock based roms do not do step 3b for stock based roms...

3b. Install the 4.2.2. base (will actually install a different recovery partition and aboot partition, however it will get your firmware back to 4.2.2. which is what almost all of the AOSP roms expect...) thread and download details here:

http://xdaforums.com/show....php?t=2719411

That download is huge and takes a while to flash, don't panic, but make sure that the MD5's match since a failed flash for that one can brick the tablet...

4. Enjoy your rooted and rommable tablet! (stop here if everything worked)

------ This is the manual process if the batch file from step 2 fails for some reason:

Step by Step Aboot/Recovery when the script fails

WARNING: I'm trying to help, I assume that you know how to recover from mistakes by reverting to stock with LG's software if needed. This is the procedure I followed by manually doing what Id10tError had in his batch file... If anything fails below I messed up in translating the instructions. I did not run the dd commands on my tablet to check since I have already done this process. Please be careful... If you find errors I will try and help... the dd command does have the ability to completely destroy your tablet if you use it incorrectly... if you have questions or see a difference between my instructions and the batch file ask and I'll be glad to answer questions. This was translated from idioterror's script, any errors are mine not his.

I assume that you have installed busybox, (this gives you a working dd on the device)

you have rooted your tablet

and you have adb working on your computer.

You could potentially also do this from the tablet itself if you copy the files needed to the proper locations (skip the push part below) and use a terminal directly. I also assume that you have downloaded idioterror's aboot replacement stuff from my earlier instructions. On the computer go to the directory that you opened the zip file and do a directory listing you should see:

the dd lines below may wrap depending upon how you are displaying this...

The directory should contain:

11/12/2014 09:59 PM <DIR> .

11/12/2014 09:59 PM <DIR> ..

05/16/2014 08:48 PM 524,288 aboot.img

05/16/2014 08:48 PM 815,104 adb.exe

05/16/2014 08:48 PM 96,256 AdbWinApi.dll

05/16/2014 08:48 PM 60,928 AdbWinUsbApi.dll

05/16/2014 08:48 PM <DIR> busybox

05/16/2014 08:48 PM 11,001,856 recovery.lok

07/07/2014 04:41 PM 4,156 runme.bat

then type

adb shell

su

mkdir /sdcard/flash_tmp/

exit

exit

adb push ./aboot.img /sdcard/flash_tmp/aboot.img

adb push ./recovery.lok /sdcard/flash_tmp/recovery.lok

adb shell

su

chmod -R 777 /sdcard/flash_tmp

dd if=/sdcard/flash_tmp/aboot.img of=/dev/block/platform/msm_sdcc.1/by-name/aboot

dd if=/sdcard/flash_tmp/recovery.lok of=/dev/block/platform/msm_sdcc.1/by-name/recovery

rm -rf /sdcard/flash_tmp/

exit

exit

adb reboot recovery

unplug the cable once it starts rebooting and enter TWRP recovery...

It will be dim if you are coming from the 4.4.2 base, go to a dark room if needed so you can see it and flash a newer 4.4.2 recovery next if you are planning on using stock roms, or flash the 4.2.2. base otherwise... see my earlier post for a link to the recovery thread or the 4.2.2 base.

All of this information was posted by me in the following thread (you may want to read it there for full context)

http://xdaforums.com/lg-g-pad-83/help/v500-im-able-to-bootloader-t2936670/