Tested fix BIOS package for the Lenovo ThinkPad T450s laptop, machine type 20BW; the name gives no motherboard number or revision, so confirm compatibility by model and board label. Such dumps are used to reprogram the SPI flash when a ThinkPad fails to start, shows a corrupted firmware state or bricked after an update. Open the RAR with WinRAR or 7-Zip, review the included files, read the original chip first and keep that backup, and check the chip capacity against the image before writing with a programmer.
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 @generalbios. 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 →