Firmware for the ASUS UX305CA board revision 2.0, meant for a W25Q64 flash chip, delivered as a 3.66 MB RAR. The W25Q64 is a 64 Mbit (8 MB) Winbond SPI flash, so the extracted image should be 8 MB to fit it. Read the chip with a programmer and back up its contents before writing, then select W25Q64 in the programmer software. Confirm the PCB revision reads 2.0, as images for other revisions may not boot.
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 →