"a) Make sure the case is in Media mode

b) Close the camera app and then try the scroll

c) Scroll slowly and check if the volume bar appears on the Mobile phone screen

d) If the volume bar changes but the sound is still low, check the volume in the music/video app and follow the ""Low Sound"" steps in the Common Issues sheet

e) Remove ""Noise Buds VS402 Gen2 - Box"" from the Bluetooth settings, restart the Mobile phone's Bluetooth and connect the case again

f) If the scroll does not respond at all (no volume change and no camera shutter) on any Mobile phone - do RPU"