If the voice command and volume button methods are not working, it might be a software issue. I would recommend resetting your device to factory settings. This will erase all data and bring the device back to its original state.
To do this, follow these steps: 1. Press and hold the volume up and volume down buttons at the same time for about 10 seconds. 2. When you see the Google logo, release the buttons. 3. You'll see an Android mascot and an exclamation mark. Press and hold the volume up button, then press and release the volume down button. 4. Use the volume buttons to scroll to "Wipe data/factory reset", then press the volume down button to select it. 5. Scroll down to "Yes", then press the volume down button to select it.
If the issue persists after the reset, please contact our technical support team for further assistance. You can submit a service request here.
Best regards,
Arjay1_Lenovo