Modified BIOS for the IBM ThinkPad T61, described by the name as free of the security chip, which suggests a version with security chip or supervisor restrictions removed. The ZIP archive is 1.95 MB. Such images are typically written to the SPI flash with a programmer to clear locks on second-hand units. Keep a full backup of the original chip, since it holds serial and UUID data, confirm the image size matches the installed flash, and be aware of the ownership questions around removing protection.
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 →