Lenovo G50-70 BIOS for the NM-A271 mainboard, in a 3.15 MB RAR archive. The NM-Axxx board code follows the LCFC (Lenovo-Compal) scheme and is printed on the motherboard, which is the first thing to check before flashing. The dump is meant to be written to the SPI flash chip with an external programmer when the firmware is corrupted or the board will not start. Read and store the original contents first, and make sure the image size matches the installed chip, since a mismatched image will not fit.
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 →