Kyocera Product Configurator

. While visually striking, these skins are often criticized for heavy bloatware, aggressive background task killing, and occasional performance lag. The "hero" of the 12X story is the Custom ROM

A custom ROM is a modified version of the Android operating system that is not officially supported by the device manufacturer. It's essentially a customized version of the Android OS that has been tweaked and modified by developers to offer new features, improved performance, and enhanced functionality. Custom ROMs can be based on the stock ROM, but with significant changes and additions that cater to specific needs or preferences.