BIOS dump labelled 4420s, stored as a raw 4.00 MB binary image. The name gives only the model designation; no brand, board number, revision or firmware version is stated. A raw image like this is normally written straight to the SPI flash chip with a hardware programmer such as a CH341A when a laptop is bricked or stuck on a corrupted BIOS. Read and save the original chip contents first, confirm the chip capacity is 4 MB, and check the board number on the PCB against a known-good source before writing.
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 @biosfilebins. 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 →