Firmware package of 2.27 MB for the Lenovo B40-30 laptop, labelled all-in-one, which usually means the archive bundles the BIOS and related images in one set. No board number or version is given, so check the main board label and compare it with any notes inside. Such dumps revive notebooks that show no display or boot after firmware damage, programmed directly to the SPI chip. Read and keep the original contents before writing, and confirm each image size matches the flash chip fitted.
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 →