When I got my Phantom v2+ back in May, I installed the DJI Phantom 2 Vision Assistant_3.0 software. I elected not to upgrade the firmware at the time, but I have activated NAZA mode. I've now decided I'd like to upgrade, but when I connect the software to the Phantom, no upgrade message appears on the opening screen. When I go to "Upgrade", the firmware is shown as "3.0" and no upgrades available. Do I have to download a new "assistant" package before I can upgrade the firmware? Thanks for your help.