When using OPPO a11, long press the power button on the right side of the phone to turn on the phone. While the phone is charging, plug the charger into the charging port on the bottom of the phone and make sure the charger is connected to the power source.
Then, long press the volume up button and volume down button above the volume button on the right side of the phone, and press the volume down at the same time to adjust the volume of the phone. At the same time, you can also find the sound and vibration options in the phone Settings to adjust. When using the OPPO a11, we can flexibly operate the startup, charging and volume adjustment, so that the phone can better meet our needs.
Long press the power button and volume down button to restart the device.