How to Flash LG G5 SE LGH840 to Fix a Bootloop using LG Flash Tool (KDZ Method)

How to Flash LG G5 SE LGH840 to Fix a Bootloop using LG Flash Tool (KDZ Method).

Flash LG G5 SE LGH840. Flashing is installing a new ROM on Android phone. You can flash your Android phone to get out from bootloop or any Android phone problem, even you can get new feature and new customization from the manufacturer. But, here we will explain to you how to fix your LG G5 SE from bootloop by flashing a new firmware using Lg flash tool. This firmware is a kdz file, so this also called flashing with Kdz method. When your LG G5 SE boot loop it will only show LG logo when your phone boot up. It's starting the system but nothing happens on your phone. It will be always returned to starting and rebooting your phone.
During flashing your phone, all data and file will be deleted from your phone. Therefore try to always make a backup before this bootloop happens on your LG G5 SE. This guide only for LG G5 SE with H840 versions, your device should has this specification,
flash LG G5 SE
flash LG G5 SE
  • Launch in 2016, April
  • Comes with 5.3 Inches, IPS LCD capacitive touchscreen, 16M colors
  • Powered by: Octa-core (4x1.8 GHz Cortex-A72 & 4x1.2 GHz Cortex-A53) CPU, Qualcomm MSM8976 Snapdragon 652 chipset, and Adreno 510 GPU.
  • Supported by; 3 GB of RAM
  • Run on Android 6.0.1 (Marshmallow), upgradable to 7.0 (Nougat) OS
  • Featured with 16 MP of primary camera and 8 MP of secondary camera


  1. We need the LG Firmware (Kdz file), you can download the LG firmware by yourself or visit the available link below.
  2. LG Flash tool 2014 You can get this tool from the available link below.
  3. LG driver
  4. LG mobile support tool and install it on your computer.

Step By Step Flashing LG G5 SE.

  1. Make sure all prerequisite tools above successfully downloaded on your computer folder.
  2. Once it completely downloaded, extract them one by one in the same folder.
  3. Make sure to fully charge your LG G5 SE phone or at least you have 78% of battery capacity.
  4. Make sure the LG driver correctly installed on your computer in order to make your device successfully detected on the computer.
  5. For some reason LG driver may not installed successfully on your computer, therefore you must install Visual C++ Runtime Library before install it.
  6. Now, run the LG Flash Tool 2014. (right click at LG Flashtool2014.exe - select run as administrator)
  7. run as administrator -  flash LG G5 SE
    run as administrator -  flash LG G5 SE
  8.  For the next flashing stage, please follow this guide. Flash Kdz Firmware with LG Flash tool.

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