Large 841 MB RAR archive labelled TCL S6500, a TCL television model. The name gives no main board or panel details, and at this size the archive most likely holds a full software package or eMMC and flash dumps rather than a single small BIOS. Verify the main board code and panel version on the set before restoring anything, as TCL fits different boards within one model. Keep a backup of the existing memory contents before writing.
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 @testedsoftwarefiles. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)