BIOS package for a desktop motherboard identified only as H81-M1, with the name carrying version 4.5.5 and noting a variant with HDMI output. The H81 token suggests an Intel H81 chipset board, though the maker is not stated. Packed as a RAR archive of 3.30 MB, it should hold the flash image to write to the board's SPI chip with a programmer. Confirm the board model and HDMI presence match your unit, read and save the original chip contents first, and check the image size matches the flash 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 →