Top 29 LG K40 hidden features, hacks & secrets

LG K40 is a mid-range Android smartphone with a huge list of features. The known & noticeable features are NFC, Fingerprint Scanner, Face Unlock, Selfie Flash, Expandable Memory, Wifi Calling, Notification Light, etc. However, there are many more features that are hidden or unnoticeable.

In this post, we are going to trace those hidden features & secrets. We are also going to check out the LG K40 hacks. So, without further ado, Let’s get going –

LG K40 Hidden Features, Secrets & Hacks – LM-X420

1. Hide apps & photos on K40

lg k40 hide photos

You can hide apps and photo albums on LG K40 from kids and prying eyes. I’ve laid down the whole procedure in the below post and video –

LG K40 Hidden Apps & Photos

Read moreTop 29 LG K40 hidden features, hacks & secrets

LG K40 Android 10 Update / Will LG K40 get Android 10?

Like Stylo 5, K40 MetroPCS was also launched with Android Pie 9.0 in July 2019. Looking at the history of LG MetroPCS Android Updates all the budget phones have got at least one major update in the lifetime.

LG K30 was updated from Nougat to Oreo, Aristo 3 was updated from Oreo to Pie. LG Stylo 4 is most likely getting a Pie update. The factory unlocked Stylo 4 is already upgraded to Android Version 9.0

Will LG K40 get Android 10 Update?

lg k40 android 10 update

Going by this logic, it’s very likely that K40 will and Android 10 update in the near future. It’s quite new and is already popular among the mid-range smartphones.  It’s quite capable in the hardware department as well. After all, it shares the same Octa-Core Processor as LG Stylo 5.

The LG K40 successor i.e. K51 comes with Android 10 out of the box. K40 should get Android Update along with Stylo 5 in the near future.

On your K40, you should keep checking for new updates.

LG K40 Android Version

lg k40 android version

To check the current Android Version of your LG K40, go to Settings > General > About Phone as shown above.

lg k40 android pie 9.0

In “About Phone”, look for “Software info” and tap it to open.

The software info page shows the current firmware and software version.

The LG K40 Android Version is 9 and the software version is X420MM10k.

Now, Let’s check for the new K40 software update in the Update Center as follows –

LG K40 Software Update / Android 9.0 Pie Update

lg k40 update center

Open Settings, select the General Tab, and tap on “Update center”.

lg k40 software update

We can do App Updates as well as System updates via the Update center.

The System update is downloading as of now.

lg k40 system update

We can also Pause the update if needed.

Now, the security update is getting installed. Once done, the phone will reboot.

Again go to the update center and check for an Update.

lg k40 android update

After installing a few system updates my K40 is upgraded to the latest firmware.

While checking for a new update, it says “Your system is up to date”.


lg k40 android version 9

As of June 09, 2020, the LG K40 latest Android Version is 9.0 & the Software Version is X420MM10p.

Unfortunately, LG K40 is still on Android 9. Let’s hope it gets Android 10 like K51 in a few month’s time.

Keep the “Automatic System Updates” setting on to get the regular updates automatically.

LG K40 Automatic System Updates

To receive automatic system updates on your K40, we have to keep this setting enabled in the “Developer Options”.

Refer to the below post to enable developer options on your K40.

LG K40 Developer Options – How to turn on 


Now open Developer options by going to “Settings” > “General” > “Developer Options”.

Look for “Automatic system updates” and enable this setting.

You can also update your K40 firmware by flashing a stock firmware file using the LGUP Flash tool as per the below procedure.

LG K40 Firmware Update – lmx420mm MetroPCS Stock ROM

lg k40 firmware update via LGUP

Check out the below tutorial to download and install stock kdz firmware on your K40 –

LG K40 Firmware Download & Update


For any query or feedback, feel free to leave a comment below.

Is the LG K40 waterproof, a good phone, MHL compatible, Qi enabled?

As an owner of LG K40 or a would-be buyer, few questions may arise in your mind. You may like to know whether the K40 is water-resistant or not? Can you mirror it to your TV screen via MHL cable? Is it a good phone? Is it 5G compatible? Is it Qi-Enabled. Is it compatible with Fortnite? etc.

In this post, we are going to find an answer to the above questions as well as other questions related to LG K40. So Let’s move ahead –

1. Is the LG K40 Waterproof / Water-Resistant?

Read moreIs the LG K40 waterproof, a good phone, MHL compatible, Qi enabled?