Originally Posted by durtbag

From the Instructions:
In order for the ESC to recognize the transmitter throttle range, the ESC must be calibrated it. The ESC must be calibrated when setting up a new ESC, using a new transmitter, or change the ATV or EPA settings of the radio.

The ESC must be calibrated after each firmware update or the ESC will not work properly. There are 3 points that need to be set, “full throttle”,”full brake” and the neutral point.

This, and you must disconnect the ESC from the app.