Firmware archive for the MSI B450M-A PRO MAX II desktop motherboard, 27.6 MB in RAR format. The name does not say whether it contains an official update file or a full SPI dump, so check the files and their sizes after extracting. Update files normally go through M-Flash, while a raw dump is written with a programmer when the board will not post. Match the image size to the flash chip capacity, and read the existing chip before writing so the original can be restored if 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 @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 →