There are two ways to reset the device:

1)    Using a stylus, pen or similar object, activate the reset button on the upper right-hand side of the unit.  This will disconnect the power supply and completely shut-off the unit.  Then, use the on/off/standby button on the right-hand side of the top panel to turn the device on again.

2)    If the device is completely turned off, you may reset the device to the factory settings (removing any setting customizations, saved favorites, etc. that you may have previously changed) by going to Options – Settings – Options – Factory Settings.