251 KB RAR archive for the ASUS F1A55-M LX3 motherboard, without the PLUS suffix. The contents are not described by the name, but a firmware image is the most likely payload. Use 7-Zip or WinRAR to unpack it. A clean BIOS for the matching model lets a technician restore a board whose flash was corrupted by a failed update. Always dump the current chip before overwriting it, and confirm the PCB is the LX3 version rather than the LX3 PLUS.
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 @boardview. 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)