Circuit schematic in PDF for the Xiaomi M1s phone, with the Chinese part of the name meaning Xiaomi schematic diagram. It covers the electrical design of the mainboard and is the reference for tracing power rails, checking charging and battery circuits, and following signals between the processor, memory and peripherals. Combine it with the M1s P3 top and bottom placement sheets to locate the parts physically. Confirm the board version on the PCB, because the M1s and the original M1 boards are not identical.
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 @mobileschematicshub. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.