I never updated the firmware on any of them except one time on Kiss because of my little sister -(she wanted GR (*.srt )subs).
I don't care about the Kiss anymore I stopped using it a long time ago - since 90% I encode with 2 b_vops and packed bitstream, but I'm almost 100% sure back when I was using it, it wouldn't accept packed bitstreams of any kind 2 and 1 b_vop neither, so there must be a fix/update in a firmware they released.
...out of topic now I think 99%
THX again