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help me oad for cc2541 android

Hello
Currently I am using a sensor tag oad features in Android apps.
See the guide, I Download bim files and image files to the A board.
And using the sensor tags of OAD funtion, the image B  upgrade from the app to board.
However, it occurred in 'oad serviece initalization failed' error of the sensor tag app and the app had died.

plz help me...........