Baseband of v20a,b and c are same.
Flash it in recovery..
If you haven't unlocked your bootloader, follow this (the kdz file is corrupted. You don't need it, since you say your phone is rooted) :
After downloading files, follow instructions from ...
4.1.2 pre-rooted. Flash any one using kdz updater.
1. Install supersu.
2. Install ROM manager, select e610 as your device and flash cwm (or twrp) recovery.
Here's a guide to do the sam...
Sadly, there is only 1 method available to get lg l5 4.1.2 rooted.
Install a pre-rooted firmware (and, that's what v20a or b or d is) using kdz.
Can I flash v20d with cwd for my e612
I couldn't find any flashable v20 firmwares. And, since LG updater tool uses kdz files to update firmwares, i think it's the best way to go.
Also, after flash (through kdz), bootloader wi...