BIOS firmware for the Lenovo P50 mainboard, board code BP500 and LCFC number NM-A451, revision 1.0. The 8.01 MB RAR likely contains a full SPI image, probably sized for an 8MB flash chip, for programmer flashing. NM-A numbering is used by LCFC, the Lenovo-owned ODM. Before writing, read and save the original chip, since it holds serial and licence data. Confirm that the board number and revision on the PCB match, and that the image size equals the chip 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 @afsbiosfree. 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 →