Compressed package of 502 KB named N61D2(K), resembling a motherboard model code with a K variant in brackets. Nothing else in the name explains what is inside, so unpack it and check file types first. Bracketed suffixes usually separate board variants, so match the exact marking on the PCB before trusting any firmware here. When a BIOS image is present, read and store the current chip contents, confirm the dump size equals the flash capacity, and only then program.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip