Press and hold the top button of the device. – For VOCOM II Mini, you will first hear 3 short beeps (meaning the device is in Wi-Fi Direct mode) and then a loud and long beep sound. So, it is important to keep the reset button pressed until you hear the long and loud single beep. – For VOCOM II Tough, press and hold the top button for about 10 seconds (You will not hear any sounds).
Let go of the top button. The device will now restart with the default configuration applied.