BIOS file apparently for an ASUS B350-PLUS motherboard, judging by the misspelled ASSU prefix, likely the AMD B350 desktop model, though the name gives no version or revision. The RAR archive is about 6.6 MB. Use such an image to recover a board stuck at no-post after a failed update, either with a programmer on the SPI chip or with a USB flashback feature if the board supports it. Confirm the exact model on the board, save the original contents first, and check that the image size matches the chip.
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 →