I have a discontinued LG L5 E455 Android phone that came with Android 4.1.2 OS.
I am forced to upgrade the OS because most of the apps I need to install are not compatible with this version of OS, according to Google Play.
I tried to upgrade the OS through the update option in the Android interface, it did some magic but the Android version is still the same.
I could not find any LineageOS ROM that was created for this phone.
Is it only possible to upgrade the Android OS by a custom ROM? If so, why?
Is it possible to install the official Google versions?
Why does it not work like in Linux distributions that can be installed on almost any PC?