Why is there Firmware Update on my LG X Power phone?

[Android Central Question]

I had my LG X Power phone on the charger and I turn it back on while the charger was inside my phone charging.

 

[B. Diddy]

Welcome to Android Central! System Update notifications will appear whenever the system update becomes available from the manufacturer or carrier -- it doesn't matter if it's charging or not. Most of the time, it's just a security update, but if it's something more major, like an upgrade to a higher Android version, it will give more details about it before you accept the update.