1) Put the device on charge

2) Take out the earbud which is working and check if it has sound and touch is working

3) Put it back and remove it from Bluetooth pairing and now take out the earbud which was not working

4) Connect it and then check if it is connected and there is any sound and touch is working. If it is working then no issue

5) Connect the product with APP and see if earbuds battery is showing on the dashboard, if not then RPU