Please check the settings based on your device type.

Android devices: Go to Settings > Bluetooth > soundcore C50i details > enable "Sync Bluetooth device volume with phone."

iOS devices: Check if the "Reduce treble" feature is enabled, as this limits the maximum volume of your earbuds.

PC: Try adjusting the volume on either your computer or earbuds to maximum, then adjust the desired volume on the other device.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.