X420MM10t: Metro LG K40 LMX420MM Software Update with Nov. Security Patch

Download Metro LG K40 LMX420MM Stock ROM/Firmware


LG official is rolling out a new software update for the LG K40 LMX420MM smartphone from Metro by T-mobile.

According to our sources, the Update is based on Android 9.0 Pie and it is just a maintenance update with the latest Android Security Patch.

ModelBuyer SuffixBuyer/CarrierLast Update Date

The update arrives as software version X420MM10t and includes the Nov. 2020 Security Patch.

The Update builds X420MM10t for Metro LG K40 LMX420MM is now available via OTA and LG Bridge.

You can also manually check for the update by going into Settings > General tab > Update center > System update > Check for update.

On December 21, LG officially released the LG K40 LMX420MM Stock ROM/Firmware and made it available for download. Now you can grab LG K40 LMX420MM KDZ ROM from the below link.

Download Metro LG K40 LMX420MM Firmware X420MM10t





Software Version:X420MM10T_00

OS Version:P

File Name:X420MM10t_00_MPCS_US_OP_1120.kdz

KDZ File size:2.81GB

Download: http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW92LDSDE2YIANN14BB3ZE3/X420MM10t_00_MPCS_US_OP_1120.kdz

How to download Metro LG K40 LMX420MM Firmware X420MM10t

  1. Download and install XDM download manager
  2. Copy the download URL http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW92LDSDE2YIANN14BB3ZE3/X420MM10t_00_MPCS_US_OP_1120.kdz
  3. Start a new download JOB in XDM download manager

Download LGUP DLL for LG K40

LG K40 DLL for LGUP Tool.


The DLL is used for an LG K40 smartphone with Android 9.0 PIE OS



How to install LGUP DLL for LG K40 SMARTPHONE

Unzip LGUP_K40-pie[].zip, and you will get LGUP_K40-pie[].dll

Rename LGUP_K40-pie[].dll into LGUP_common.dll

Put the LGUP_common.dll into the folder: C:\Program Files (x86)\LG Electronics\LGUP\model\Common