BIOS and EC firmware pair labelled 16L21, in a 4.30 MB RAR archive; no brand is given, though the token resembles MSI laptop board naming such as MS-16L21, so verify against the PCB marking. Having both the system BIOS and embedded controller code helps when a board will not turn on, has charging faults or unresponsive power button behaviour. Each image is written to its own chip with an SPI programmer or flashing tool. Always dump the original chips before overwriting and make sure each image size matches its target 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 →