BIOS update file for an S300CA board with the .305 extension, most likely firmware version 305, 8 MB in size. The naming follows the pattern of ASUS BIOS capsule files, and S300CA matches an ASUS VivoBook model code, although no brand is stated. Capsule files may include a header, so check that the image is a clean raw dump before writing it to a 64 Mbit SPI chip with a programmer. Back up the original chip and confirm the board revision.
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 @bios_laptop. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →