I used now another card, from a photo camera. I followed the steps, the result is the same: Drone red light blinking and controller all 4 light blinkingok if you have a SD card in the drone then just try another one because it wont connect if the card is corrupted
when you have the screen on you device that you put on the post then with the gimbal cover off start the drone and just put it down and wait after a short time the controller will buzz and the screen will change to go fly then touch that and you should get a camera view appear