I have a hexacopter from jdrones with an apm 2.5 and jdrone esc 30. I can not get any form of response from the uav when I try to go into esc calibration mode. I've checked the mission planner and was able to go through the radio calibration process so I am getting a signal from the transmitter. I just don't ever hear a tone when trying to go into esc calibration mode and I've tried both directions and sticks in case if the controls are flipped but no luck. Any help would be appreciated.