First, please try the reset button on the side of the tablet. There is a tiny ‘reset’ hole on the side of the tablet. Just use a tooth pick or a sharp stick to touch this hole, then it’ll reset automatically. If that doesn’t work, please press HOME and MENU button at the same time when you turn on the machine. Or press HOME and ‘back’ (the round’ button) at the same time when you turn on the machine. This can reset the tablet back to default factory setting. If this method still doesn’t work, you will need to reflash the tablet.