MrPlumber,

You can be the guinea pig and open the pandora box of free tuning.

Anyway all freeware tools pose significant risk, since they come with no warranties.
I will even doubt the xdfs,...

You got couple of options.

1.Buy commercial product
2.Downgrade to `04 7603 OS and use existing xdf
3.Create your own xdf
4.Ask someone to fix basic stuff for you[I guess tunning is not an...