Upgrade LG G3 Dual LTE [D856] to Android 6.0.1 Marshmallow
Download latest firmware Android 6.0.1 Marshmallow for smartphone LG G3 Dual LTE [D856]
The latest firmware android 6.0.1 marshmallow, starting upgrade from a PC with Windows 10/8.1/8/7/XP (this is a custom firmware for this smartphone, you install it as is).
The driver of the USB and software to update the firmware of the smartphone (run the .exe file for help on upgrading and starting the update).
Root firmware android 5.1.1 lollipop (rip from original firmware lg g3 dual lte [d856]).
Update firmware for other LG smartphones.