BIOS image for the ASUS ROG Zephyrus S GX531GS, version 305 per the name, supplied as a raw 16.0 MB binary. That size corresponds to a 128 Mbit SPI flash, which is common on this class of gaming laptop, but confirm the marking on the chip itself. A technician writes the file directly with a programmer to revive a board that no longer boots. Read and store the original contents first, because serial number and machine data may need transferring from the old dump.
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 @efibios. 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 →