I cannot believe that I'm the only one who noticed that!  I would write it off as a faulty device but I've got two brand new once here that produce identical output with the same unmodified firmware (V1.9) Here is the description of the problem: 1. Initialize IMU level2. Slowly turn 90 in roll3. Return to horizontal orientation.4. Slowly turn -90 in roll5. Return to horizontal orientation.6. Re…