This is the AT&T LG M150 Android Nougat 7.0 Version User manual in English and Spanish provided by the manufacturer.
The LG M150 for AT&T was released with Android 6.0 out of the box, and it received the Android Nougat 7.0 software update in June 2017.
LG official has revised the LG M150 user manual in order to reflect the Android OS Upgrade changes.
Download LG M150 User manual / Guide – Android Nougat 7.0 Version
Hope the digital version LG M150 User manual can teach all the basics of using the AT&T LG M150 smartphone based on Android Nougat 7.0
Just like many other AT&T LG Devices, the LG M150 supports software update via OTA only.
There is no way to download firmware for AT&T LG M150 with IMEI. So, please do not try to modify the OS of your phone, please do not try to root your LG M150!