After getting my drone back from repairs (I went through DJI to do this) i am now struggling to connect the controller to the drone? Ive followed instructions by pressing "linking RC" and "confirm frequency settings" in the "Remote Controller Settings" menu and then pushed the small button on the side in with a pen but the two devices will not pair. Does any body know why this might be? (Also i paid for the screen attached to the controller and am not using an iphone or anything like that if that helps)