RAR archive holding firmware extracted from a Lenovo-style BIOS update package, with version code JKCN53WW taken from a .fd capsule file. The name gives no laptop model, so identify the matching machine from the JKCN prefix in its own update documentation. Extracted images like this are typically used to rebuild or compare SPI flash contents with UEFITool or a hex editor. Note that a raw capsule region is not always a full chip image, so check its size against the flash chip and back up the original dump 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 @dtechbios. 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 →