I used the file included in this post (Step 3)...http://forum.xda-developers.com/show...8267&nocache=1
I believe it changes the boot img to an older one though, but it is the only method I have found that will work for now.
You will need to modify the runme.bat file to make it run with 20d.
There will be a section in the file that looks like this...
if %FWVER%==4.4.2 (
if /I %MODEL%==LG-V500 (
if /I %FWBUILD%==KOT49I.V50020a (
if /I %FWBUILD%==KOT49I.V50020b (
This is checking for the version of the 4.4.2 on the device and since the version on your tab is 20d it will error out...Just go ahead and change the V50020b to V50020d, save the file and try again.
I then used the .zip file found in this post...http://forum.xda-developers.com/show....php?t=2551499
Be sure to download 4.4.2-v500-TWRP_188.8.131.52-recovery.zip.
Let me know if this works for ya.