My controllers will not update. I have successfully updated the firmware on the aircraft and updated to the latest version of the DJI Go app. The notes say the controllers should be updated: "Be sure to update the remote controller’s firmware to the latest version after you upgrade the aircraft’s firmware" The app is telling me the same. The notes also say updating via the app willl not work with older firmware (that's me - skipped the last one) so to do it the traditional way with the SD card connected to the USB port. Have tried that - nothing happened. I do seem to have all the intelligent flight modes in the app now but I'm worried something will go awry if I fly this thing. Any suggestions?