Using this tutorial, you can Upgrade, Downgrade or Unbrick your LG K40 in a few minutes. You can even restore your K40 if it was stuck during an OTA (over the air) firmware update.
So, without wasting time Lets’ get going –
For the ease of understanding, let’s divide the process into parts –
How to Upgrade, Downgrade or Unbrick an LG K40 MetroPCS using LGUP
STEP 1: Downloading the necessary files and installing LG USB Driver
The first step is to download the necessary files such as LG Mobile Driver, LGUP Flashing Tool and the LG K40 kdz stock firmware file. Follow the respective links to download the necessary files –
LG Mobile Driver version 4.4.2
LGUP Dual Mode – Extract the zip file on your computer
LG K40 MetroPCS Stock Firmware X420mm10g – Extract the zip file on your computer
Download the above files on your computer and extract the zip files before moving further.
Let’s start the process by installing the latest LG Mobile driver on our computer