Typically, the only reason you would need to reset the LeapTV is if you are giving it away and want to completely remove your information from the device.
To reset the LeapTV:
1. Start with the LeapTV powered OFF
2. Turn the LeapTV ON by pressing the power button
3. Immediately press and hold the SYNC button until you see the green light ring on the front of the console blink
4. Follow the instructions on screen to complete the reset