Press and hold the Left SOFT K.E.Y and Right SOFT K.E.Y, and at the same time, use the stylus to press the RESET button at the bottom of your device. You will be presented with a menu saying 'press SEND to restore factory default, press END to exit', if you press SEND Your device will be set back to factory default settings.than Press "OK" to boot
(The L/R soft keys are the "--" keys just above the the Green phone and Red phone buttons) You can also use clear storage in settings. WARNING!!! HARD RESETTING WILL ERASE EVERYTHING ON YOUR DEVICE. MAKE SURE YOU HAVE A BACKUP!