1. Turn on the controller, long press and hold SELECT+START+ UP key for 3 seconds to enter calibration mode, and the red light will flash slowly (0.5Hz)
2. During calibration, lightly press the left and right triggers twice, and rotate the left and right joysticks twice; (Emphasize not to press the trigger too hard here)
3. Short press SELECT+START+ UP key to exit calibration mode, calibration of the joystick and the trigger can be completed simultaneously.
NOTE: when calibration, you need to keep the trigger in linear staus, not micro.