ASUS PRIME B460-PLUS desktop motherboard BIOS, version 1806 according to the name, in a 7.56 MB RAR archive. ASUS releases are often capsule files intended for EZ Flash or BIOS FlashBack rather than a raw chip image, so check whether the extracted file needs its header stripped before using a programmer. It is handy for restoring a board stuck after a failed update. Confirm the exact model on the PCB, and keep a backup of the existing chip before any external write to the SPI flash.
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 @biosdumpcomputer. 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 →