Main BIOS for the Lenovo L340-15IRH laptop, firmware version BGCN29WW, packed in a 5.24 MB RAR archive. No board number is given, so identify the motherboard yourself before flashing. The version code follows Lenovo's usual naming, where the WW suffix marks worldwide releases. Technicians use such a dump to restore a bricked machine by programming the SPI flash directly. Make sure the extracted image size equals the chip capacity, and always back up the original content, which may carry serial and system 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 @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 →