Hard Reset

From MB Wiki

Users may have various device troubles. As a last resort we suggest utilizing the Hard Reset. A hard reset will reset the unit to all default settings and delete all history from the unit. This is accomplished by turning the unit on while holding the mode button. You will lose all your settings, but you can re-upload your profile by hooking up your device to Training Center (for PC users) and then tell it to download the history from your device. TC will then ask you which profile to use, if you answer TC, it will upload its profile into the device.