Firmware archive named for the W540SUMB board, with an OD suffix, packed as a 3.53 MB ZIP. The W540SU pattern resembles Clevo board naming, though the name states no brand, BIOS version or chip type, and the OD tag is not explained. Open the archive to see whether it holds a BIOS image, EC firmware or both. Before programming the SPI flash, confirm the board marking on the PCB, make a backup read of the chip, and check that the image size 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 →