LG K40 X420QM Firmware Flash File

How To Install ROM LG K40 X420QM

First, you need to download and extract the LG K40 X420QM stock firmware package on Computer.
After extracting the zip package, you will get the Firmware File, Flash Tools, Drivers, and How-to Flash Guide.
In the first step, you need to install the provided USB Driver on your PC, and if in case USB Driver is already installed, skip this step).
Follow the How-to Flash Manual Guide to flash the firmware on your LG K40 X420QM Android device