I was able to upgrade the firmware on the Phantom 3 Professional but not on the radio controller. I downloaded the latest firmware and followed all the instructions. On the RC I get only a red light and beeps, no blue or green light, and when I check the sd card afterward there is no .txt message giving any results. Is there anything I should do? Since the drone firmware upgrade was successful, is it safe to fly even if I couldn't upgrade the firmware of the controller?