T56U11 universal LCD board firmware, release 21, dated 28 March 2017 according to its name, which also marks MENU+1147. That token likely refers to the factory menu access code sequence used to enter service settings on this board family. The 2.68 MB RAR archive likely holds a single flash image. Technicians use such files to revive boards that fail to boot or to change panel parameters. Before programming, verify the board marking and panel resolution, and keep a copy of the current chip contents in case a rollback is needed.
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 @bios_bin_file. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →