You need to set the arming time to at least 2,5 seconds for Spektrum TX. You should really use the Castle Link to set up these ESCs, there should have been a coupon for a free Link in the box if you bought one within the last 18 months.

The ESC defaults back to Sensorless if it does not sense a sensored motor at power up. Try programming it again with the sensor wire attached first. These ESCs are a pain to set up through the TX, the Link or Field Card is a MUST HAVE .