ASUS X43B BIOS image, 2 MB with no file extension, and the name notes a 25Q16 flash chip, a 16 Mbit SPI part that matches the image size. Board number and revision are not stated, so confirm what is printed on the PCB before relying on it. The file is written with an SPI programmer such as a CH341A once the chip is identified. Adding a .bin extension may help some programmer software open it. Back up the original chip and verify the write afterwards.
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 →