MetroPCS LG K40 Firmware Update: X420MM10G – August Security Patch

Download LG K40 Firmware Update X420MM10G

LG is rolling out a new software update for the LG K40 (aka LMX420) on MetroPCS.

The Update is software version X420MM10G, and it includes the August 2019 Android Security Patch.

LG K40 Firmware Update: X420MM10G

Release Date: August 28, 2019

Security Patch Level: August 1, 2019

Anti-rollback version: ARB00

Software Version: X420MM10G

Android Version:  Pie, 9.0

What is new?

– Security updates from Google have been included in this update.

The latest security update for LG K40 MetroPCS build v10g is now available via OTA and LG Bridge.

You can also install the software update by flashing the X420MM10g_00_MPCS_US_OP_0808.kdz from below links with LGUP.

Download LG K40 Stock Firmware


The LG K40 runs Android 9 Pie out of the box.  Will LG offer OS upgrade for the LG K40 model launched in 2019? Do you think it will get the Android 10 Update?

Need to download MetroPCS LG K40 owners manual? You can grab it from this link.

LG K40 USB drivers, The latest LG USB driver is software version V4.4.2. You can get it from this link.

The LG K40 on MetroPCS received the FCC approval on August 6, 2019.

MetroPCS LG K40 Frequency Bands and Network Compatibility

It features supports for 4G LTE with the following Bands:

LTE Band 71
LTE Band 12
LTE Band 17
LTE Band 13
LTE Band 26 (Cell)
LTE Band 5 (Cell)
LTE Band 66 (AWS)
LTE Band 4 (AWS)
LTE Band 25 (PCS)
LTE Band 2 (PCS)
LTE Band 41

If you have more questions about this LG K40 smartphone, please visit LG USA official support website here