Download X420MM10k: New Software update for LG K40 Metro by T-Mobile

The LG K40 Metro from T-Mobile is getting a new software update over-the-air. The latest update is pushing the software version X420MM10K to the device. It is based on Android 9.0 Pie. This new software improves the user experience and the functionality of the K40 Metro. So, basically, it is a maintenance update.

The new update is moving over-the-air and should soon knock into all the devices. However, those users looking to install the update manually without waiting for the OTA, then we have put up the kdz firmware file for this latest update. It means if you download and install the firmware on the T-Mobile LG K40 Metro, then you can upgrade tot he X420MM10K build. To make things easier for you, we have a complete tutorial at your disposal which will help you in manually flashing the firmware. Let’s check it out.

LG K40 Metro X420MM10k Software Update

Automatic OTA Download

Normally, the OTAs roll in batch. So, that’s why we only see a few users getting the update. In case you have not received the X420MM10k update as of now, you can try searching for it manually. It is very easy.

  • Simply go to device Settings > General.
  • Tap on Update Center > System update.
  • Now tap on Check for Update. 

If the new software shows up with the build number we have here, then Download it immediately. We always recommend using Wi-Fi to download the software updates faster. Alternatively, you can download the firmware zip file from the download section and flash the zip file manually. We have a tutorial linked below that will come in handy for you.

Download X420MM10k Firmware

First, let us view the information about the new firmware for the LG K40 Metro.


Firmware Info

Latest Firmware

IMEI: 3599621006xxxxx

Model: X420MM10k

Suffix: AMTPOP

Region: MTP

Version: X420MM10K_00

Android OS: Android 9.0 Pie

Here is the download link for the firmware zip.

Firmware Download

X420MM10k for LG  K40 Metro | Download

How to Install X420MM10k Stock Firmware on LG K40 Metro.?

Usually, people in the haste of flashing a firmware do not use the correct tools and software required to carry out an installation process successfully. So, we have listed out the tools you must have such as the LG USB drivers, LG Bridge and LG UP tool etc in the requirements section below.

Points to Remember


GetDroidTips will not be responsible for any software or hardware related issues that may incidentally happen while or after you perform the firmware installation using the firmware provided in this tutorial. Follow the guide and update the device at your own risk.

Guide for Kdz Firmware Installation on LG Smartphone

Below we have put up the tutorial to install a kdz firmware file on any LG smartphone. That should help you out as it is a detailed tutorial.

How to Install stock kdz firmware on any LG Smartphone

So, what are you waiting for.? If the OTA is yet to show up on its own, then grab the firmware file and flash it now to upgrade your LG K40 Metro to X420MM10k software. We hope that this guide was useful to you.


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