Tested BIOS for a Lenovo desktop motherboard identified as IB250CX, revision 1.0, in an 11.2 MB RAR archive. Lenovo uses codes of this kind for OEM boards, and B250 in the name suggests the Intel B250 chipset. A verified dump like this restores a board that fails to post because of corrupted firmware when written to the SPI chip with a programmer. Compare the board code and revision on the PCB, and save the original chip, which can hold the system serial and other unique data.
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 →