If your talking about the Yuneec USA site as thats the one I use you are right about trying to find firmware for the CGO3 camera. About a week ago they upgraded the web page and now its all screwed up and hard to find stuff.
I did manage to find CHO3 firmware but that was under the wizard Icon and you need to scroll down a tad to find it.
Now here is the interesting part and I have no idea what firmware this is. The last firmware version number for north america was V1.80 A, and the EU version was V2.40 E.
Now if you download from the spot I told you about the firmware for north america now says V2.4 A. There has been no one posting about a Firmware update for the CG03 so I wonder about this file
Downloads - Yuneec