[Phone/ Pad] Troubleshooting- Malfunction of amplification

Troubleshooting for malfunction of amplification is described as below :

1. Press the Volume Up button to increase volume when you talk on device.

2. Restart your device. 

3. Update firmware to the latest versionSettings > About > System update > Check Update. 

4. Access to Safe Mode ( long press power key > Tap and hold " Power Off " > Tap " ok ":If your phone / Tablet works well in Safe Mode ,malfunction may be caused by some 3rd party apps . Please reboot your device and check again if it works well.

5. Backup your data and perform factory reset