ThinkPad X260 BIOS dump labelled BX260 for the LCFC board NM-A531 revision 3.0, described as unpass, which usually means a version with the supervisor password removed. The RAR holds an image to write with an SPI programmer such as a CH341A to clear a forgotten BIOS password or restore corrupted firmware. Match revision 3.0 on the PCB, save the original chip contents first so system data can be returned, and confirm the image size fits the flash chip before programming.
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 →