Working BIOS for the Dell OptiPlex 760 desktop, with E93839 and GA0404 in the name, packed as a 3.54 MB RAR and described as fully tested. Those codes look like board or part identifiers, so compare them with the labels on your system board before flashing. Program the image with an SPI programmer to bring back a machine with corrupted firmware. Read and save the current chip first and check that the image size matches the capacity of the installed flash 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 .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 →