A BIOS / firmware dump. Shared as “Slim Black C21_VC PW-MN491 bios U26-U6”, 4.00 MB.
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 @ShareMan_Electronic_Files. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →