BIOS dump for the Lenovo IdeaPad U400, with LU470 also named, built on a Wistron board numbered 11228-2 and sized for a 4MB flash chip. The RAR archive holds the image intended for direct programming of the SPI chip with a hardware programmer such as a CH341A or RT809. Five-digit numbers with a dash suffix follow the Wistron board scheme, so confirm the 11228-2 marking on the PCB first. Always read and save the original chip contents before writing, and verify the image matches the 4MB capacity.
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 →