Archive for a board with Wistron number 19861-1, labelled MKB N TGL 8L MB, where TGL likely refers to Intel Tiger Lake and 8L to an eight-layer PCB. The 27.9 MB RAR does not state its contents, so it may contain schematics, boardview or firmware. The 19861-1 style number follows Wistron's scheme, used for Dell, Lenovo and HP notebooks. Open the archive, identify each file, and confirm the board number on the PCB before tracing circuits or flashing firmware.
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 @schematiclaptopramkushwaha. 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.