4 MB BIOS image for the Lenovo Z500, labelled OK and forming the larger half of a two-chip set alongside a 2 MB file. The 4 MB image belongs on the 32 Mbit SPI flash; flashing it to the wrong chip will not work. Technicians program such images with a CH341A, RT809 or similar device to restore boards with corrupted firmware. Read and archive the original chip first, check the chip capacity, and confirm the motherboard number and graphics variant match the board on your bench.
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 .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →