ASUS F1A55-M LX3 PLUS motherboard archive, RAR format, 166 KB. Only the model appears in the name, so extract the files to see whether they contain firmware or other repair data. The LX3 PLUS is a distinct variant of the AMD A55 board family, so files for the plain LX3 or LX PLUS should not be treated as interchangeable with it. If you are programming the SPI chip, read and save its existing data and confirm the image matches the chip size 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 @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)