I have the exact same problemThe 302 error is fixed, but I can't get it to communicate with my Spark. It's plugged into my laptop via USB (tried both the docking station port and a port on the laptop itself). When the Spark is off, the battery blinks showing that it's charging, but when I launch DJI Assistant 2 (with or without the Spark powered on) it just sits there with the "How to connect Inspire 2 ?" graphic and caption. Doesn't seem to matter whether it's connected to the controller, either.