This guide is designed to help you navigate through this issue and restore the sound on your headphones. Let's get started and bring back the sound to your H30i headphones for a smooth and uninterrupted calling experience.

1.  If using a Windows computer, the microphone needs to be set to hands-free.

2. Press the volume + and play/pause buttons for 5 seconds to restore the factory settings, then reconnect the headphones.

3. If the other party hears no sound or the sound is low, confirm whether the left and right earbuds are worn in reverse.