How To Flash LG K40 Metro LMX420MM (X420MM10k) Firmware kdz File


If you’re looking for the LG K40 Metro LMX420MM (X420MM10k) Stock Firmware. you need to flash, it can sometimes be difficult to locate online. For LG K40 Metro LMX420MM (X420MM10k). In this Tutorial about Unbrick LG K40 Metro LMX420MM (X420MM10k) ROM. And download Flash Files tested and working file.

I have explained the method which is used by People or the Repairing Shops. I hope This Tutorial Will Help You To install Stock ROM on LG K40 Metro LMX420MM (X420MM10k).

LG Stock Firmware KDZ ROM

This article contains the “LG K40 Metro LMX420MM (X420MM10k) Stock ROM Firmware“. That will allow you to recover your LG K40 Metro LMX420MM (X420MM10k) mobile into its initial Factory state. Additionally, you can use the file to change your phone to the newest version. You’ll find these below files useful if you have used the flashed customized builds on the device. brick your device, change your device and also come back that device to the factory state.

The Benefit Of LG K40 Metro LMX420MM (X420MM10k) Stock ROM:

There are a lot of benefits of having the stock ROM of the LG K40 Metro LMX420MM (X420MM10k) device. You can Fix Bootloop and Black screen issue by flashing back the stock firmware.

If you are facing some software related issues on LG K40 Metro LMX420MM (X420MM10k), then you can flash the stock ROM to fix that.

You can Unbrick and unroot your LG K40 Metro LMX420MM (X420MM10k) by flashing back the stock firmware which will give you your device’s warranty back.

LG K40 Metro LMX420MM (X420MM10k) Stock ROM Details:

  • Gapps File: Included
  • Device Supported: LG K40 Metro LMX420MM (X420MM10k)
  • Tool Supported: LG Flash Tool
  • Os:

Download: X420MM10k_00_MPCS_US_OP_0923.kdz

Pre-Requirements To Flash LG K40 Metro LMX420MM (X420MM10k) Firmware:

A. Install LG K40 Metro LMX420MM (X420MM10k) ADB & Fastboot on Your Computer:

LG USB Drivers allows you to connect your LG Smartphone and Tablets to the Windows computer without the need of installing the LG Kies application.

It also allows you to Flash LG Stock Firmware on your LG Device using the original drivers.

Just download the LG Android USB Driver for Windows and setup.

B. LG K40 Metro LMX420MM (X420MM10k) Flash Tool:

LG Flash Tool is designed to flash LG smartphones with stock firmware packages. Custom ROMs rarely do flash with Odin, as this program does not recognize .zip extensions, but only .kdz files.

C. Take Full backup Of LG K40 Metro LMX420MM (X420MM10k):

In order to ensure that you do not lose your data, it is very important to get its regular backup. Thankfully, there are many methods to perform Android complete backup.

To take full back of LG K40 Metro LMX420MM (X420MM10k) it is important to take full LG K40 Metro LMX420MM (X420MM10k) backup and its IMEI just read below helpful article and make sure you all important data is saved.

What To Do Before Android Firmware Installation?

How To Install LG K40 Metro LMX420MM (X420MM10k) Stock Firmware:

1: Download and install the LG USB Driver on your pc.

2: Download and extract the LG Flash Tool on your pc.

3: Now, you need to boot your LG Device into the downloading mode.

To boot into the downloading mode, you need to Press and Hold the Volume UP button of your Mobile device and connect the USB cable to the LG Mobile device.

4: Now Open LGFlashTool2014.exe.

5: Now, under the Select Type Drop Down, Choose CDMA.

6: Now, Click on the Select File button and Locate the (LG K40 Metro LMX420MM (X420MM10k) Stock firmware ROM) of your device.

7: Now, Click on the Normal Flash Button.

8: Now, under the Phone read information dialog box, click on the Start Button.

9: Now, a Small Country and Language Dialog Box will open on the Screen. You need to Choose the Language as per your choice.

10: After Choosing the Language, Click on the OK button.

11: Now, the LG K40 Metro LMX420MM (X420MM10k) Stock ROM Flashing process will start automatically and may take 5-10 minutes to complete.

(depending on the size of the firmware).

Once the flashing process is completed, your Mobile device will reboot automatically.

Once your Mobile device is ready to use, disconnect it from the USB cable and Close the Flash Tool on your computer.


  • Please read and understand the Full Guide Before Flashing LG K40 Metro LMX420MM (X420MM10k) Firmware.
  • Use these instructions at your own risk. We will not be responsible for everything that happens to you or your device. resulting from the use of information in this guide.
  • Your smartphone must have a 70–80% charge.
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