Firmware dump for the Lenovo B450, 2.00 MB, with no file extension and no motherboard number in the name. It is most likely a raw image ready for a programmer. The capacity matches a 16 Mbit SPI flash chip. Use it to restore a board with corrupted BIOS, but first confirm the PCB number and chip size match. Read and save the original contents before writing, then verify the write to make sure the image programmed correctly.
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 @bios_laptop. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →