Tested working BIOS for an HP All-in-One desktop using the Quanta DAN97AMB6D0 board, revision D. The number follows Quanta's DA...MB pattern, printed on the PCB, so the HP model name matters less than the board code. Reflash the SPI chip with a programmer to fix no-boot or corrupted firmware faults. Back up the original chip first, since it may hold the serial and product data, and check the image size against the installed flash.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →