Two BIOS images, 2MB and 8MB, for the Dell OptiPlex 990 system board with PWB revision A00, packed into a 5.09 MB ZIP. The board carries two separate SPI flash chips and each dump belongs to the chip of the same capacity. A programmer such as a CH341A is typically used to write them when the PC is bricked after a failed update. Verify the PWB revision printed on the board, check chip markings to identify which is which, and save the existing contents 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 @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 →