LG K40 Manual PDF – Spectrum, AT&T, Metro, T Mobile, Unlocked lmx420

LG K40 offers bang for the buck. At a very budget price of around $100, it offers the same hardware and similar features as LG Stylo 5. For the very reason, its offered by most of the major US carriers.

LG K40 is available for AT&T, MetroPCS, T-Mobile, Spectrum Mobile, US Cellular, Cricket (LG Harmony 3), Tracfone (LG Solo) as well as in Factory Unlocked Variant.

In this post, I’ve accumulated all the Manuals in one place. You can Download your respective User Guide in English or Spanish as follows –

 

LG K40 User Manual PDF in English & Spanish

All the LG K40 variants come with a 5.7 inch HD Screen with an 18:9 aspect ratio. They all have Octa-Core Processor & 2GB RAM. All the K40 Variants are equipped with Selfie Flash, Fingerprint Sensor & Face Unlock.

However, all are not lucky enough to get 32GB Internal Storage, NFC, Android Pie 9.0 & 13MP Camera with PDAF. Along with downloading the User Manual, let’s find out the differences between the K40 variants –

1. LG K40 Manual AT&T

AT&T K40 is equipped with a 2 GHz Octa-Core MediaTek Processor. It has got 32GB internal storage and NFC.

It comes with a 13MP Camera without PDAF (Phase Detection Autofocus).

While many of the K40 variants have Android Oreo, AT&T K40 comes with Android Pie out of the box.

LG K40 Manual AT&T

You can download the AT&T English User Manual in PDF from the below link –

English

DOWNLOAD

LG K40 AT&T Manual English PDF

The above “Table of contents”, belong to the AT&T K40 Manual.

Spanish 

DOWNLOAD

AT&T LG K40 Manual PDF

2. LG K40 Manual Spectrum Mobile

 

Apart from AT&T, the rest of the K40 variants are equipped with Qualcomm Snapdragon 1.8 GHz Octa-Core CPU.

Spectrum K40 comes with Android Oreo 8.1 which can be upgraded to Android 9 via OTA System update.

Similar to the AT&T variant, Spectrum K40 lacks NFC & PDAF.  It has got 32GB Internal Storage and 13MP rear camera.

Download the K40 Spectrum Manual from the below link –

LG K40 Manual Spectrum Mobile

English

DOWNLOAD

Spanish 

DOWNLOAD

3. LG K40 Manual MetroPCS

 

The highest specced K40 comes from MetroPCS & T-Mobile.

It comes with NFC & PDAF (Phase Detection Autofocus). The rear camera is 13MP.

The processor is 1.8 GHz Qualcomm Snapdragon SDM450.

It comes with 32GB storage and Android Pie.

You can grab the MetroPCS PDF manual as follows –

LG K40 Manual MetroPCS

English

DOWNLOAD

Spanish 

DOWNLOAD

4. LG K40 Manual T-Mobile

The T-Mobile K40 is just the same as the MetroPCS variant.

Get the K40 Manual in English or Spanish from below links –

LG K40 Manual T Mobile

English

DOWNLOAD

Spanish 

DOWNLOAD

5. LG K40 Manual US Cellular

 

The US Cellular K40 is just the same as the Spectrum variant. It’s also upgraded to Android Pie 9.0 via OTA System Update.

The Manual is available in English & Spanish. You can download it as follows –

LG K40 Manual US Cellular

English

DOWNLOAD

Spanish

DOWNLOAD

6. LG K40 Manual Factory Unlocked

 

The Factory Unlocked K40 is the lowest specced variant.

It comes with 16GB internal storage and 8MP Rear Camera.

It lacks NFC & PDAF.

It uses the same Snapdragon 1.8 GHz CPU as the rest of the K40 variants. It comes with Android Oreo but can be upgraded to Pie via System Update.

The User Guide for the Factory Unlocked K40 is available in English & Spanish. Use the below links to download the Manual.

LG K40 Manual Unlocked lmx420qn

English

DOWNLOAD

Spanish 

DOWNLOAD

 

For a query related to any K40 variant, feel free to leave a comment below.

LG K40 Drivers LM-X420 – USB, ADB, Windows 10 & Mac

There are many instances when we need to connect our LG K40 to the computer. A successful USB connection is established only after the proper installation of the USB driver.

The LG K40 drivers needed for different kinds of USB connections are MTP driver for file transfer, ADB interface driver for ADB mode or USB debugging and USB serial port driver for download mode or firmware update via LGUP flash tool.

Let’s download the LG K40 Windows 10 / Windows 7  driver and learn how to establish a successful USB connection between our K40 and the computer by installing it –

How to install LG K40 USB Driver – Windows 7 & 10

Download the Latest LG K40 Driver for Windows and Mac from the respective download links –

LG K40 Mobile Driver v 4.4.2 – Download the setup file and save on your computer

Read moreLG K40 Drivers LM-X420 – USB, ADB, Windows 10 & Mac

LG K40 MetroPCS Firmware Download & Update -LMX420MM Stock ROM

The need to flash a stock firmware arises when either you’ve bricked your phone or unable to do OTA (Over the air) System update.

In some cases, the phone bricks when the firmware update process gets stuck in the midway. If your LG K40 is stuck on the firmware update screen then you’re at the right place.

To flash stock firmware /ROM on LG K40 we need to download a few files –

1. LG Mobile USB Driver v4.4.2 setup file – Download and install this file on your PC

DOWNLOAD

2. LGUP Dual Mode.zip  – Download & Extract this file on your computer

DOWNLOAD

3. LG K40 MetroPCS Stock Firmware ROM X420MM10g.zip – Download and extract this file on your computer

DOWNLOAD

LG K40 Stock Firmware / ROM Download & Software Update – MetroPCS LM-X420MM

Let’s divide the whole process into 4 steps for the ease of understanding –

STEP 1: Installing the USB Driver and booting the phone into Download Mode

 

LG K40 MetroPCS firmware download

 

Read moreLG K40 MetroPCS Firmware Download & Update -LMX420MM Stock ROM