Purchased an used H9 and from the description of the item the seller says it never been registered .But when I used it with the H9 control,the app said this pedal has registered by another account, I try to contact the seller but have no reply,so I can’t re-register and control the pedal with my IOS devices now. The only thing I want to know is how to deregister and re-register it,any one can help me?