BIOS for the Lenovo B490 laptop, board LA48 MB 11264-1M with part number 48.4TD07.01M, packed in a 3.34 MB ZIP file. The board number follows the Wistron scheme, the ODM that built this Lenovo family. Use the image to reprogram the SPI flash with an external programmer after a failed update or firmware corruption. Compare the number on your motherboard silkscreen before use, check that the image size equals the flash capacity, and back up the existing chip so serial and system data are not lost.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →