Make sure the remote is on before turning on the esc. Then push and hold the button until it beeps. then hold full throttle and push button, after beep, hold full brake and push button. After beep, esc reboots and you are set.

If, instead of recalibrating, you can see the lights on the switch are going to green when applying throttle, and red when applying brake, then you are probably OK to hold the button for a second or two and hook up the pro-gauge to resave your profile settings.