Based on most mobile phone hardware platforms on the market, Android 9~14 and other systems can be customized according to user needs, from boot screen to kernel system modification.
Application scenarios: system trademark and desktop system customization, pure system customization to reduce advertising harassment, cloud phone implementation, multi-application system, new core service functions, unimpeded system-level "robot" automation, etc.
The following video is a customization case of the Android 12 system of a Samsung mobile phone 8 years ago, with new functions: kernel microserver (IoT distributed microservice node), logo customization, desktop customization, etc.
