Android installation package for Dangbei Desktop (当贝桌面), a third-party launcher for smart TVs and TV boxes, at version 4.1.7 build 1218, about 4.54 MB. The launcher replaces the stock home screen with a simpler interface for apps and inputs. Technicians sometimes install it on boxes after firmware reflashing or when the original launcher is cluttered or broken. Install by sideloading the APK from USB or via ADB, and check compatibility with the device's Android version before replacing the default home app.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @tv_software. Enginerys does not host this file.