UPDATE..........
OK fixed it. Windoze XP does not work with the latest DJI Assistant. I borrowed a PC with Windoze 8 on it and in order to get the A2 and Zenmuse Z15 talking to one another, you must update the firmware with Zenmuse Assistant v1.4 and A2 Assistant v1.4 first. Then you can...
I'm using Assistant v1.6 on Windows XP and I'm unable to login for software upgrade, it just says 'Error: username or password incorrect' but I KNOW that I'm using the correct username and password as I can login to my account on DJI website. I can also login to the assistant for a Naza v2 and...