BIOS for the Qbex NX520 notebook on the MT40RAU motherboard, distributed as a RAR archive of 2.12 MB. The name gives no revision or firmware version, so confirm the board marking before use. Qbex is a Brazilian brand that sells laptops built on boards from outside designers. A dump like this is written with an SPI programmer to bring back a laptop that powers on without video after a corrupted update. Make a full backup of the original chip and verify that the file size fits the installed flash.
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 .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 →