Troubleshooting lmx420

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

DOWNLOAD

LGUP Dual Mode – Extract the zip file on your computer

DOWNLOAD

LG K40 MetroPCS Stock Firmware X420mm10g  – Extract the zip file on your computer

DOWNLOAD

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

Read moreLG K40 Stock Firmware / ROM Download & Software Update – MetroPCS X420MM

Let’s bypass the Google Account Verification on LG K40 LM-X420 using the latest and easiest method. With this method, we can bypass FRP on K40 without using an app or computer.

This tutorial would work for all the K40 variants including K40 MetroPCS lmx420mm, K40 T-Mobile lmx420tm, K40 AT&T  lmx420as, Factory Unlocked K40  lmx420qn, K40 US Cellular lmx420qm,  & K40 Spectrum Mobile with model number lmx420qm6.

On doing a hard reset via Hard Keys, i.e. Volume Down & Power Button on LG K40, we need to go through the Google verification screen to complete the factory reset process.

This is Google’s Factory Reset Protection also known as FRP.

To get past this screen we either need to enter the Screen Lock PIN, Pattern or password (In case the phone had a Screen Lock), or sign in with the last synced Google account on this particular device.

The good news is that it’s quite easy to bypass this verification screen on K40 using this latest hack.

Follow the below screenshots to bypass the Google Lock on LG K40 –

Let’s divide the whole process into 4 steps –

How to Bypass Google Verification on LG K40 LM-X420 2019-2020

As a first step, go back from the Google Verification screen to the first screen of the setup wizard.

STEP 1: Gettings Access to the Youtube app via the Accessibility Settings

Read moreLG K40 FRP Bypass 2019 2020 Google Account without PC lmx420mm