Lenovo firmware archive whose name only states that it holds BIOS plus EC, meaning the system BIOS image and embedded controller firmware. No model or board number is given, so identify the target before using it. The 5.09 MB ZIP may contain separate files for the SPI BIOS chip and the EC, or a combined image. The EC firmware controls power-on, charging, keyboard and fans, so a mismatch can leave a board dead. Verify against your board markings and back up both chips 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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →