After my last post I did some more research and came up with this info.
Kernell software
R4 DS
v1.03 Dec 2006
v1.04
r4ds.com, r4ds.net are Dead Sites
R4-II
v1.11 30-7-2007
through to
v1.18 24-4-2008
r4ds.cn Dead email
R4-SDHD
v1.20 19-7-2008
through to
v1.22 1-10-2008
ndslr4.com...