Exa first setup issue


I’m setting up an exacopter for the first time, using a Pixhawk autopilot and Hi Flyhyper ESC. I went through all the calibration process with Mission Planner 1.3.41.
Once the ESC calibration is done, I powered the motors giving throttle. I would expect the motors to change their rotation speed to compensate once I rotate the copter, but the rotation speed of the motors remain constant at different attitude angles. The motors don’t react to radio commands either. They seems to respond only to throttle, but no variation to attitude command from the radio. I’m using a Spectrum DX8.

I would appreciate any suggestions on how to fix this.