Android application package of 10.6 MB whose name in Chinese characters reads as DiliDili TV, apparently a video streaming app. It is software rather than a repair document, so it contains no schematic, boardview or firmware data. An APK is installed on an Android phone, tablet or TV box after enabling installation from unknown sources. Scan third-party APK files for malware before installing, and keep in mind that apps like this are not related to board diagnosis or chip programming.
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.