Coming from STOCK 4.1.2/4.4.2 ANY OPTIMUS G PRO VERSION
STOCK 4.4.2,[5.0.1] MUST USE {GPRO_Recovery_6.0.4.4.apk} B4 USING FREEGEE..
HOW TO OBTAIN TWRP FROM FREEGEE
INSTALL FREEGEE, 1. DOWNLOAD TWRP, 2. BACKUP EFS (It uses internet connection, so make sure first)
How to Flash LG G3 v6
1. Reboot into Recovery using FREEGEE
2. Backup your current ROM's Nandroid using TWRP (System, Data, Cache & Boot)
3. Wipe all (System, Data, Cache, Dalvik)
4. Flash Rom
5. Flash Sound Fix (To Fix Reboot issue on making Call)
6. Flash F240x Modem Patch (To get signals)
Reboot System
Skip very first wizard without any internet and association of any Gmail or LG account, Just set basic info i.e. Name etc.