Firmware for the ASUS Z170-P motherboard, version 0321 according to the name, packed in a 5.73 MB RAR archive. The image may be an official update file rather than a full dump, so check whether it carries a capsule header before writing it directly to the SPI chip. ASUS boards of this generation can also use the BIOS update tool in setup or the USB flashback function where supported. Back up the existing chip, and confirm the version is suitable for the installed CPU.
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 →