BIOS file for the Lenovo MTQ45MK desktop board, described in the name as a 4 MB image and delivered in a 2.08 MB RAR archive. The 4 MB figure refers to the uncompressed dump, which should match a 32-megabit SPI flash chip. Use a hardware programmer to write it when the board does not POST because of corrupted firmware. Note that MTQ45MK differs from the similar MTQ45NK, so confirm the exact board code on the PCB and keep a backup of the original chip.
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 @afsbiosfree. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →