All steps to upgrade your LG G3 to Android 6.0 MM (Only vs: D855, you will lose all your data, backup your files if you want) 1. First of all download these files and extract them all ( D855MM, LG Drivers, Lg Flash tool) 2. Install LG Drivers. 3. Now run as administrator Lg Flash Tool. 4. In Lg Flash tool, change Phone mode to CS_Emergency and load kdz file downloaded D855MM.