Supercell uses device fingerprinting. If you install a private server APK and then later install the official CoC from the Play Store, the official app can detect residual files. Result: No appeals.
Pro players often use old version private servers to test attack strategies. Since the physics engine and troop pathing differ between versions, practicing a "GoWiPe" on a 2015 server helps you master fundamentals without risking trophies on live servers. clash of clans old version private server
Open your file manager, locate the downloaded APK, and tap install. Supercell uses device fingerprinting