BIOS for the Lenovo IdeaPad Y340 built on board LA-4142P, delivered as a 1.02 MB RAR archive. The LA-xxxxP code follows the Compal numbering scheme, identifying Compal as the ODM that manufactured the motherboard. The image can be written to the SPI BIOS chip with an external programmer to bring back a laptop that no longer posts. Before writing, save the original chip contents, confirm the LA-4142P marking on the PCB, and verify that the file 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 @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 →