Working BIOS for the HP ProDesk 400 G7, board revision A, in an 11.1 MB ZIP archive. Because a separate microtower dump of a different size exists, check which form factor and flash chip your unit uses before choosing an image. A dump like this is usually written with a hardware SPI programmer to recover corrupted firmware. Save the original chip contents first, since serial and licence data live there, and make sure the image length matches the chip.
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 →