Lenovo BIOS image with version string 82CN27WW (V3.00), supplied as a 4 MB ROM file. The name gives no laptop model or board number, so identify the target machine from its current BIOS version or label before use. A 4 MB image fits a 32 Mbit SPI flash chip and can be written with a programmer such as a CH341A. Read and keep the original chip contents first, confirm the board matches this firmware family, and ensure the chip capacity equals the file size.
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 .rom file
A BIOS image as shipped by the vendor (commonly AMI) — often the BIOS region only, without descriptor or ME.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →