To reset a Sony Bluetooth speaker, press the reset button on your Bluetooth speaker with any pointed object. In some models, a reset button may not be present, whereas holding the power button for 10 seconds does the job. The method to reset depends on the model of your speaker. One thing to remember is the Bluetooth pairing settings do not erase on resetting the device; however, sound settings may change. In some models, you may also experience a change of button functions.