BIOS ROM for the ASRock B450M-HDV R4.0 motherboard, firmware version 7.40, in a ZIP archive of about 10.6 MB. It is meant for updating through the board utility or reprogramming the SPI chip with an external programmer when the board fails to post after a bad flash. Save the current chip contents before writing, confirm the board is the R4.0 revision and not the earlier version, and make sure the image size matches the flash capacity.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →