BIOS package for the Lenovo IdeaPad 520-15IKB, machine type 81BF, with firmware version 6JCN25WW named in the file. The IKB suffix denotes Kaby Lake Intel processors in Lenovo naming. This 4.87 MB RAR serves to recover a laptop that fails to start after a bad update, usually by writing the SPI chip with a programmer. Confirm the machine type on the bottom label, save the original chip first since it holds serial and system data, and check the image size matches the flash.
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 →