Dell BIOS dump for the DH81M01 desktop motherboard, an H81-based Dell board, reported in the name as a fully working image. The CR1220 token most likely refers to the coin-cell holder marking near the BIOS area, though the name does not explain it. The RAR archive should be unpacked and the image compared in size with the SPI flash before use. Read and keep the original chip contents first, then program with a CH341A-type or similar programmer, and confirm the board marking matches DH81M01 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 →