Firmware package tied to Wistron board number 19861-1, labelled MKB N TGL 8L MB. TGL most likely refers to the Intel Tiger Lake platform and 8L to an eight-layer mainboard, though the name does not spell out the laptop brand or model. At 19.3 MB the RAR may hold more than a single image, so check its contents before use. Wistron numbers boards as five digits plus a revision suffix; match the code silkscreened on the PCB, back up the existing SPI chip, and flash only an image sized for that chip.
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 →