It looks like another user is having a similar problem http://discuss.px4.io/t/rc-radio-calibration-detected-0-radio-channels-to-operate-px4-you-need-at-least-5-channels/6669/5?u=j_andia
It looks like another user is having a similar problem http://discuss.px4.io/t/rc-radio-calibration-detected-0-radio-channels-to-operate-px4-you-need-at-least-5-channels/6669/5?u=j_andia