Firmware for the Lenovo B50-45, AMD E1 processor variant, ZAWBA/ZAWBB platform on Compal board LA-B291P, packed in a 2.37 MB RAR. It is used to restore the BIOS SPI chip with a programmer when the laptop powers up without display or after a failed update. The CPU variant matters, so confirm that your board carries the E1 APU and the LA-B291P number. Read and keep a copy of the existing chip, and make sure the image size matches the flash capacity before writing.
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 →