Lenovo Z500 BIOS for the 4M flash chip, marked OK as a working read. On this board the firmware is split across two chips, and this 4 MB image matches the 32 Mbit part, while a companion 2M file covers the smaller one. Program it with a CH341A or similar SPI programmer when the notebook stays dead after a bad update. Identify the correct chip by its capacity marking, keep a backup of the original data, and write both halves from the same set.
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 @biosbigarchives. 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 →