Lenovo IdeaPad Z500 BIOS image for the 2M chip, marked OK. The tag indicates the 2 MB part of a two-chip arrangement, with a separate 4 MB image covering the larger flash. The size matches a 16 Mbit SPI chip. Use it with a hardware programmer to recover a board that does not POST after a corrupted flash. Confirm the chip capacity printed on the part, save the original contents before erasing, and write the matching 4M image from the same set to keep the regions consistent.
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 →