To upgrade the aircraft again: format the sd card and make sure the card have no other file on it, now you need to turn off the aircraft and insert the sd card, on the right side of the aircraft you will see a hole insert a pen or whatever on it to press the remote sync button. Hold the button...
My friend i was in the same situation with you, the only solution you have is to downgrade the remote controller and upgrade it again, after yo need to upgrade the aircraft aigain
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