(1)Confirm the smartphone is properly mounted (meaning it is level). Instructions on how to level the smartphone can be found in FAQ #10.
(2)If the phone is properly mounted, and the smartphone is still not leveled, use the following two methods to solve the problem
 Connect the NANO SE with the App, select Gimbal Set-Filter-Adjust the filter
 Mount the smartphone on NANO SE, turn on the gimbal and keep it leveled, the gimbal will automatically calibrate after 10 seconds.