Today, I turn on the RC and aircraft and I got a message to upgrade the firmware. I hit the upgrade button on DJI GO app, but after that I got message "upgrade failed"... and light blue (white!) appears on the RC LED signal. After that, I tray to upgrade aircraft with SD cards, but after 20 min. signal LED on gimbal (before red-green) turning off. I let the aircraft turn on (there are a sound from the gimbal - like reading the SD card, but after about 10 min. nothing change. I turn off the aircraft. So, now, when I turn on the RC and aircraft, DJI GO app message is "aircraft is not connected"!!! Before few min. I install 1.3.20 firmware on aircraft. After that, I turn on the RC, go to "enter camera", status... its a message to upgrade the firmware. After downloading, hit "upgrade" ... and message "upgrade failed... current ver. 1.3.20... download ver. 1.3.20". I turn on the aircraft, BUT still no connection between RC and aircraft. On RC LED light blue still. I lost all day to make aircraft and RC in connection but I can not. Please HELP !!! ???????