Lenovo B5400 firmware dump in a 3.39 MB 7z archive. Besides the model name it carries no board number, revision or chip information, so the technician must confirm compatibility from the PCB markings. Such images are commonly flashed to the SPI chip with a CH341A or similar programmer to fix units that power on without display or that failed a BIOS update. Back up the existing chip contents before writing, and make sure the extracted file size matches the installed flash part.
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 @biosfiles. Enginerys does not host this file.
How to open a .7z file
High-ratio compressed archive, often used for large BIOS collections.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →