The E9 error code refers to a brake issue, so a new head unit would be a great starting part. Please contact our Customer Care Team for further support.
The Jetson Element Pro is designed for ages 12+ and can reach up to 12 miles on a single charge. Keep in mind that range varies depending on rider weight, riding style, speed, terrain, and other factors.
To turn on your element scooter, press and hold the power button for 3 seconds. Then place one foot in front, and the other in the back at a 70-90 degree angle. Kick to start the scooter (this feature can be disabled) and gradually press the black throttle on the right, until you are comfortable with increasing speed.