A legitimate takes a stable version of Facebook Lite (usually version 350.0 or earlier, as later versions break compatibility) and modifies its manifest file to trick the OS into thinking it is compatible with KitKat.
Modifying an APK violates Facebook’s Terms of Service. However, for personal use on an unsupported device, enforcement is rare. Distribution of repacks is technically copyright infringement. facebook lite android 442 repack
If you own such a device, you have likely encountered the dreaded message: “This app is incompatible with your device” when trying to install the standard Facebook app. Even the official —designed for low-end phones—has slowly increased its system requirements, leaving Android 4.4.2 users in the dark. A legitimate takes a stable version of Facebook