Second 8.00 MB firmware image for the 2560p, carrying the same unexplained c suffix as its companion plus a copy marker. The two may be identical or taken from different machines, so compare them before use. No board number or revision is included in the name. Technicians write such dumps to the SPI flash with a CH341A-style programmer to repair a dead BIOS; always save the existing chip contents first and check that the flash size on the board equals 8 MB.
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 @biosfilebins. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →