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,
  • 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.

- Download Kdz file by yourself using the web browser and IMEI phone number.
- Get the Firmware from this website. Here
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 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 LG Flash Tool 2014. (right click at LG Flashtool2014.exe - select run as administrator)
run as administrator -  flash LG G5 SE
run as administrator -  flash LG G5 SE
7. Once the program launched, you can set the program as the following image below.
flash LG G5 SE
flash LG G5 SE
  • Number 1: At Select type, you can choose 3GQCT
  • Number 2: Select DIAG at phone mode drop-down menu.
  • Number 3: Browse where your kdz saved on your computer drive.
  • Number 4: Click normal flash, it will Flash ROM without losing any data. Only use this when you need to fix system error. For some version, you will see CSE flash beside normal flash. CSE flash used for fresh format your phone. CSE flash used to downgrade or upgrade phone firmware.
8. Once you click Normal flash, it will bring you to next window as shown the image below.
9. On the select country & Language click clear phone software update registry button.
clear phone software update registry
clear phone software update registry
  • Then you will see pop-up windows that say registry clear completed, now you can click accept button.
  • At the country drop down menu select a different country
  • At the language drop-down menu, select your desired country

10. Now, go to your phone and turn off your LG G5 SE.
11. Then connect your LG G5 SE to the computer via USB cable while the press and hold Volume Up button.
12. Release volume up button when your LG G5 SE enter download mode. And your phone will show this screen.
enter download mode LG G5 SE
enter download mode LG G5 SE
13. Now, back to LG Flash tool 2014 window and click OK button.
14. Now, you will automatically launch the LG Mobile Support Tool window on the screen.
15. Just wait for the flashing process until it done. It will take a while depending on firmware size and phone models.
16. Once it reaches 100% completed, your LG G5 SE will reboot automatically, and you can click the exit button.
17. Unplug your phone from USB cable, and you can start to set your phone for the first time before it used.

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