BIOS dump for the Dell OptiPlex 9020 desktop, taken from the first SPI flash chip, an N25Q032AX3E, giving a 4 MB image that matches its 32 Mbit capacity. This board uses two flash chips, so this file covers only one half, and the second chip needs its own matching dump. Write it with an SPI programmer such as a CH341A after reading and saving the original contents. Check the chip marking on your board matches, since loading this image onto the wrong chip will not work.
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 @vinafix_bios. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →