Firmware for the ASRock B85M Pro4 desktop motherboard, supplied as a 5.21 MB ZIP; the name gives no BIOS version or board revision. It can be written to the SPI flash with an external programmer to recover a board with corrupted firmware. Because the revision is not stated, check the extracted file against the chip capacity and compare with your board revision. Keep a full backup of the original chip first, since it stores the onboard LAN MAC address.
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 →