How to adjust oppo mobile phone information without sound?

If the sound is low (speaker) when the phone is muted or turned off, we suggest you try the following methods:

1, turn up the volume to see if it is normal;

2. Check whether the hands-free volume of mobile phone calls is normal, and eliminate abnormal resources such as video and music;

3. Whether the sound hole of the speaker is blocked by dust or has foreign objects, you can try to clean the sound hole with a dry soft brush;

4. Restart the phone and observe whether it is restored;

5, backup data (contacts, text messages, etc. ), restore the factory settings;

If the problem persists, it may be a hardware failure. Please bring the purchase invoice, warranty card and machine to the OPPO customer service center for testing, and professional engineers will solve it for you.

This answer applies to all OPPO models.