I was trying to downgrade my firmware on my Phantom 4 to fix issues with RTH and crawling with obstacle avoidance. Somehow, it loaded a Phantom 3 firmware package. I isn't recogniseby any apps now - DLI Go, DJI 4 Go or DJI Assistant 2. I can't get it back. The multi button reset for Phantom 4 does not work to get it back to factory settings. Please, anyone, HELP!