Schematic set for the Xiaomi POCO M3 in PDF form, packed inside a 4.20 MB RAR archive. Once extracted it opens in any PDF reader and lets a technician search for net names and reference designators. Typical uses include tracing the battery and charging circuit, following PMIC rails to the processor and memory, and finding test points when hunting a short or a no-power fault. Check that the board revision printed on the PCB matches the drawings, as Xiaomi sometimes revises layouts within one model.
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 @cyberlanelectonik. 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.