BIOS backup for the HP x360 13-AR0000AU convertible, an AMD-based model, on Wistron motherboard 18740-1. It is a 7.37 MB RAR archive taken from a unit, according to the name. Wistron identifies its boards with a five-digit number plus revision suffix. The dump is intended for writing to the SPI flash with an external programmer after corruption. Since it comes from another machine, it may carry that unit's serial data, so save your original chip and confirm the image size matches before flashing.
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 →