Step 1: Plug your Stethee Pro into a USB power source.
Step 2: While the device is plugged in, press and hold the control button.
Step 3: While the control button is pressed, use a paper clip or sim removal tool and gently press the reset switch. You will feel a vibration and the device will flash light blue, then reset. Release the control button once the reset is pressed. Wait 60 seconds prior to using the device.