How To Flash Stock Firmware on LG G3 With LG UP Software | Guide. 

Flash Stock ROM on LG G3. This is some versions of LG G3, D850 (AT&T), D852 (Canada), D855 (Europe), D851 (T-Mobile), On this guide we will show you how to flash LG G3 using new official software from LG, This software is LG UP. This software works like LG Flash tool 2014. You can use this tool to upgrade your LG G3 device, or fix a bootloop / bricked on Android LG G3 smartphone. 

This LG G3 is the smartphone with 5,5 Inchi wide IPS LCD capacitive touchscreen, 16M colors, work on Android OS, v4.4.2 (KitKat), upgradable to v6.0 (Marshmallow), and supported with Quad-core 2.5 GHz Krait 400 CPU, Qualcomm MSM8974AC Snapdragon 801 Chipset, Adreno 330 GPU, combined with 2 GB of RAM and 13 MP of Main camera and 2,1 MP on secondary camera. And this device Released 2014, June.

Below, is full guide to flash LG G3.

Download Firmware For LG G3 .

Download all firmware and tools below ;

1. Download Stock Rom LG G3   :

2. If you can not find the KDZ file from the link above, you can try to download the KDZ by yourself.

• Download KDZ file for all LG smartphone device.

3. Or, goto the direct link below.

• Here 

4.  Download LG mobile support tool and Install.

5. Download Driver LG (Ver. 4.0) :  

6. Download Verizon LG phones USB Driver.  

7. Latest LG UP :  

8. Download LG UP DLL file, select the file support with your device.

• LGUP_8994_DLL_Ver_0_0_3_23.msi (This is for LG phones based on Qualcomm Snapdragon 810 MSM8994 SoC).
• LGUP_8974_DLL_Ver_0_5.MSI (This is for LG phones based on Qualcomm Snapdragon 800 MSM8974 SoC). 

Guide To Flash LG G3 (LG UP)

You can flash or install Stock ROM or Firmware on LG device using LGflashtool2014, but on this guide we will show you flash LG device using LG UP, This is the new official tool from LG to flash LG G3 device.

1. Download firmware or stock ROM on item no 1 or 2 or 3 above, save it on your computer drive. I save all file above in C:\LG folder.
2. Then, install all file one by one.
• First, you must Install USB Driver
• Then, Install the latest LG UP software (this software run on most windows operating system versions)
• At last, Install LG DLL file that support with your LG G3 smartphone.
3. Once all file successfully installed on your computer, Then put your LG G3 Smartphone into download mode, you can manually do it by ;
• Turn Off your LG G3 Smartphone device.
• Then press and hold Volume UP button while connect your LG G3 Smartphone to the computer using USB cable.
4. Then run LG UP software.
5. Wait a moment until LG UP detect and recognize your LG G3 smartphone. This will install a necessary USB Drivers for your device.
6. Now, your LG UP should shows up on your computer screen.

   

   LG UP - flash lg G3

7. From LG UP screen above, go to process tab and select Upgrade. (1)
8. For the next step, see this guide