Perform a full device backup. A bad APK can corrupt your OS.
Manufacturers provide built-in tools that can force 120 FPS rendering system-wide. fps 120 apk
However, if you are an experienced user who understands the risks, isolating the APK on a secondary "gaming-only" device with no personal data is the only responsible way to explore the world of 120 FPS mobile gaming. Perform a full device backup