Today AT&T carrier started rolling March 2020 security patch to their LG K40 devices. The update gets the software version to X420AS10h and still based on Android 9.0 Pie. According to the changelog, the update has nothing new except the security patch fixes. There is no info when the device will get the Android 10 update either.
If you have not received the update, then you can check for the software update manually on your device by following our instructions given here. To check new software updates, Go to device Settings > General > About phone > Update Center. Then tap on System update> Check for update. This will show you the new version if something is available.
The update will not reach every user. It may take days or weeks to get the official OTA update as it is rolling via OTA in a phase-wise manner. If you have got the download package, then you can manually install the software update by using LG Flash Tool.
- Device Name: AT&T LG K40 (LM-X420AS)
- Model: LMX420AS
- Carrier: AT&T
- Region: USA
- Software Version: X420AS10h
- Security Patch Level: 01.03.2020
- Software Supported: LG Bridge Software or LG Flash Tool
- Android OS: 9.0 Pie
Check out our simple trick to download the official LG firmware for your device.