BIOS archive for the Lenovo ThinkPad L420 on Quanta board DAGC9EMB8E0. Quanta codes start with DA and encode the platform and revision, here GC9, so the full code on your PCB must match. The 1.47 MB RAR should hold an SPI image for reprogramming the flash chip externally when the laptop is dead or stuck after a failed update. Read the existing chip first and keep that copy. Confirm the image size equals the chip capacity before writing and verifying.
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 →