BIOS dump for a Slim Black system on board C21_VC, PW-MN491, with references to U26 and U24, likely the designators of the flash chips on the PCB. No manufacturer is given, so identify the board by its silkscreened code and check the chip locations before flashing. The 2.79 MB RAR would be written with an SPI programmer, each image to the chip it belongs to. Back up the original contents, and confirm that the image size matches each chip's capacity before writing.
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 →