1, download songs with lossless sound quality to experience;
2. If the mobile phone supports HiFi, it is recommended to go to Settings-Sound and Vibration-Sound Quality and Sound Effect and turn on HiFi.
3. Replace the earphone cover suitable for ears;
4. Enter Settings-System Upgrade. Some models need to enter the Settings-My Device-iQOO (Monster) UI version /Funtouch OS version detection and update system.