I’ve had the firmware 2.04 on mine when I got the Chinese knock-off grip on my EOS 5D II. I’ve found a software bug on 2.04 (Auto ISO under LiveView does not behave correctly under certain conditions), so I’ve updated to 2.07. It fixed that problem, but now I have another.
The grip won’t recognize my batteries any more. It says it can’t communicate. If I use 5D without the grip, either of the Canon batteries communicate fine.
I thought maybe having the grip in place while flashing caused the issue, so I re-flashed it without the grip in place, and I think it is worse. Now, it says it can’t communicate. With the first flash with the grip in place, it just said 100% on both batteries, even when I only had 1 battery in it.
Anyone else have the same issue? If no easy solution, then I am either going back to 2.04 (where can I download older firmware?) or buying the genuine one. I only lost $53 on this deal I guess.