To fix this issue, please try the following steps:

1. Download the latest version of the soundcore app from your App Store (if you already have the soundcore app, it is recommended to uninstall it and then download it again, overwriting installation is not recommended)

2. Pair your earbuds with your phone. Currently, the soundcore app does not support computers.

3. Open the app, and click "Add Device" on the left page, the app will automatically connect to soundcore K20i (the first time you enter the app, you must agree to enable location permissions)

4. If the connection fails, click Set up Manually > Add Device > soundcore K20i to check whether it can be added manually (if you can't find the corresponding model on this page, you can take a screenshot).

5. Go into the region of the system, switch to English (United States), and switch the system language to English (United States).

6. If it still fails, please uninstall and reinstall the app and log in again.

If after the above you still cannot connect, provide the mobile phone model, app version, and screenshots in step 5 to our customer service.