RAR archive for the Lenovo board NM-A251 marked BOT, presumably covering the bottom side of the PCB, packed in 176 KB. The NM prefix follows the LCFC numbering scheme used for Lenovo ThinkPad boards. Bottom-side references are useful when locating components under the keyboard side, checking capacitors on power rails or matching missing parts. Use it with the TOP companion archive and verify the board number printed on your motherboard before relying on it.
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 @vinafix_bios. 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.
7-ZipWinRARThe Unarchiver (macOS)