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 Element Pro Scooter's max range is about 16 miles.
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.