Install Marshmallow KDZ on LG G3 (D855) with Flash Tool

LG has released the first Android 6.0 Marshmallow KDZ 30B for the LG G3. After releasing the Marshmallow firmware for the LG G4, now the company has started rolling it out for the older flagship.

Android 6.0 comes with a long list of optimizations. While the user interface is similar, most of the changes and optimizations have happened under-the-hood. Still, LG has put its own custom skin on the Marshmallow update for the LG G3.

If you have Lollipop installed on your phone, you can go ahead and flash Marshmallow KDZ using Flash Tool. Flash Tool is the easiest way to update your phone to Marshmallow. There are other methods as well, such as flashing a flashable Marshmallow file, but for most users Flash Tool is the way to go.

How To Install Marshmallow KDZ on LG G3 Using Flashtool

Before you continue with the installation process below, note that this method only works on LG G3 devices with D855 model number.

You need to install the right USB drivers otherwise the computer won’t be able to recognize your phone.

  1. Take your LG G3 and boot put it in download mode. To do so, turn the phone off. Then press the volume up button. While pressing the volume button, connect the phone to a USB cable. If it says “Firmware Update”, you have successfully put your LG G3 into download mode.
  2. Download and extract LG Flash Tool. Double-click on LGFlashTool2014.exe to launch the tool. Click on select KDZ file and select the Marshmallow KDZ file.
  3. Once you have selected the KDZ file, click CSE flash (will wipe data on your phone)
  4. Select country and your language and click OK to start the flashing process.

Wait for Flash Tool to finish installing the Marshmallow KDZ file on your LG G3 D855. Enjoy the latest version of Android.


  1. Good evening and thank you very much I asked whether the KDZ file is also valid for the g3 lg d855 32gb thank you

  2. My lg g3 running 5.0 screen started to fade and freese and i browsed days to find a topic like this.
    my lg g3 d855 32gb is now running 6.0 without problems 🙂

    thank you!


Please enter your comment!
Please enter your name here