I have a big problem on Cheerson CX-20 i´ve twice chcecked instalaton of proppelers and motor rotation everything is correct. I´ve tried so many times to calibrate the compass and gyroscope and all the time when i try to take-off it just tilts or flips on one side ..... It seems like my right red motor on back side of dron doesn´t work proprely ... it doesn´t have enough RPM to lift his site of dron and i canot fly with him please help me !!!!!