Android software package carrying a Chinese app name and version 2.0.1, about 7.31 MB. Nothing in the name relates to a motherboard, schematic or firmware image, so it is simply an application rather than service material, apparently a video viewing app. APK files install on Android phones, tablets and TV boxes, and their contents can be explored with an archive tool or APK analyser. Because the source is not documented, check it with an antivirus scanner and install it only on a test device if in doubt.
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.