Quick start manual for the Huawei M865C phone, a 2.12 MB PDF indexed under schematics. A quick start guide normally covers basic setup, buttons, SIM and battery installation and safety notes, not circuit-level detail. It can still help identify the handset's controls and ports during intake, but it will not show power rails or component locations. Any PDF viewer opens it. For board-level repair, look for a proper schematic or service manual for the same M865C 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 @schematic_mobiles. 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.