BIOS image for the ASUS A55BM-PLUS desktop motherboard, tagged CSM and reported as tested. CSM normally refers to the ASUS Corporate Stable Model line of boards, not a feature of the firmware itself. The 4.51 MB RAR holds the image for reprogramming the board's SPI flash with an external programmer when the board will not POST after a failed update. Back up the existing chip before erasing it, and compare the image size with the chip capacity so the write completes correctly.
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 @biosarchive. 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 →