Hello, I am trying to calibrate the controls for my quadcopter but it only responds to throttle and roll; or pitch and yaw; in other words it does not recognize all four throttle/yaw/pitch/roll I'm using a Tactic 850 remote control and my quad is a Rise RXD250. Could someone please advise? I will be at the calibration screen where it prompts you to move each stick but I am never able to complete the whole set. Is something wrong? batteries on quad and tx are fully charged. Thanks so much.