Since the BT-300 has to run the Go-4 app - and the smart controller also runs the go-4 app, I'm going to guess no...but I could be wrong. <<< CORRECTION...apparently, there are people who have gotten it to work with the latest releases...check the forum.
What I do know, however, is that it WILL work with the BT-35E box. You might want to consider going that route.
I have the BT-300s, and want to feed the live video feed from my smart controller to it. If this cant be done, what about using the Epson EHDMC10 mirroring adapter to do this? It relays HDMI, Im just not sure if it's compatible with DJI's software.