BIOS files for board C15B revision 2.0, a 3.75 MB RAR that the name says contains a 2MB and a 4MB image. No laptop brand or model is stated, but C15B is known as a Pegatron board used by several resellers. The two sizes usually correspond to separate flash chips or different chip capacities, so identify each SPI device on the board before choosing which file to write. Back up the existing contents with a programmer, write the image whose size matches the chip, and verify the result.
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 →