Lenovo BIOS image of 8 MB described as an unlocked BIOS for a Yoga 11 type machine, with the token sur left unexplained. Unlock in such names usually means a supervisor password or other lock has been removed, but the exact modification is not stated. The file is meant to be written directly to a 64 Mbit SPI chip with a programmer. Confirm the exact Yoga model and board before use. Dump and keep the original firmware first, since it holds unit-specific data.
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 .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 →