BIOS together with embedded controller firmware for the Dell Studio 1558, Quanta board DAFM9CMB8C0 revision C. The EC handles power-on, battery charging, keyboard and fans, so a corrupted EC image can leave a laptop dead even with good BIOS. Quanta DA numbering includes the project code, here FM9. Write each image to its own chip with an SPI programmer, after backing up both originals. Confirm the board number and revision printed on the PCB, and that the file sizes fit the chips.
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 →