BIOS for the B450M DS3H V2 motherboard, revision 1.x, sized for a 16 MB flash chip, compressed into a 9.97 MB RAR. The B450M DS3H is a Gigabyte model name, although the file lists no brand. AMD B450 board images like this are written with a programmer to revive a board left dead by a failed update or a CPU-support flash. Make sure the board is the V2 version and not the original, confirm the chip is 128 Mbit, and back up the current contents before flashing.
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 →