Interesting. I haven't bothered updating my firmware because the few things Nikon said were fixed seemed inconsequential to me - but I'm not impressed if Nikon has screwed over the generic grip manufacturers by altering firmware.
I almost suspect that someone could win a lawsuit against Nikon for taking away functionality with a firmware 'upgrade.'
I was able to get 9 fps with the original firmware on my McoPlus and DSTE grips - WITHOUT having the small battery inside the camera.
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Bill,
http://www.pbase.com/billmcintyre