CUAVv5 LED for version 1.8.2 and 1.9.0alpha

Did anyone test CUAVv5? When I used version 1.8.2 firmware, the LED is solid green even it was not armd(I captured the PWM output, when it was not armed ,the mean value was constant, for armed, the value changed when I shaked the controller ), is was solid green when armed.
For 1.9.0alpha, the LED seems normal, it was pulsing blue when not armed! But I could not arm the controller!