1.Run the Gyroscope/Accelerometer Calibration carefully. When you calibrate, please mount the gimbal as the tutorial shows and keep the gimbal horizontal and still.
2.Disconnect the camera connected to your gimbal, then restart your gimbal.
3.Remount the camera on your gimbal and readjust the balance on all of the three-axis.

Please refer to the calibration video.
Please turn on the electronic level to help you finish the calibration.