BIOS image for a Lenovo C355 system, tagged with the code CFT3S and version 1.0, labelled in IBM-Lenovo style and stored in a very small RAR of about 46.1 KB. The compact size suggests the archive may hold an update package or a partial image rather than a full flash dump, so check the contents before using it. Firmware of this kind is written to the BIOS chip with a programmer or update tool. Back up the existing chip first, and confirm that the image size fits the installed flash memory.
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 →