There is no sound when playing audio. How can I fix this?

1. Check whether the radio channel of the car head unit is occupied by the phone, FM broadcast, or other sources.

2. Reset the car head unit system.

3. Press and hold the product's reset button for 10s until the white light comes on, or connect to the product's WiFi, enter the password 88888888, open your phone's browser and enter 192.168.1.101 to open the admin management page, and tap Restore Factory Settings.

4. On the admin management page, find the Audio Stream Mode, manually select mode 1, wait for the device to restart, and then test. If the problem still exists, switch to mode 2 and test.