This page is containing the official link to download SAMSUNG A21s SM-A217F schematic diagrams. Basically, these SAMSUNG diagram is used for repair faulty circuit finding. Xiaomi schematic diagram is introduced with a zip package, after unzipping the file then open with an adobe pdf reader, Sumatra pdf reader.
HERE YOU CAN DOWNLOAD SAMSUNG A21s SM-A217F SCHEMATIC DIAGRAM
SAMSUNG A21s SM-A217F Schematic Diagram