Android package for BLBL, a third-party client for Bilibili video aimed at TV boxes and set-top devices, version 1.3.1 built for API level 19 so it runs on Android 4.4 and older low-version systems. It is software rather than a schematic or firmware image. This build suits aging smart TVs or boxes that cannot run current apps. Install it by sideloading, ideally via USB or a file manager, and since it is not from an official store, scan it for malware before use and keep expectations modest on old hardware.
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.