The steps to restore factory settings are as follows:
1. Press and hold "Volume +" and "Power" to enter recovery mode when the device is turned off.
2. Use "Volume -" to select Factory data reset and press the power button to confirm.
3. After about 10 seconds, select Reboot system now and press the power button. The device will restart and restore factory settings.
Please note: Resetting the device will erase all device data.