Hi PHAZE,
If you look at the offical Harley website and go to 2006 Touring bikes,then look for the advanced audio system and click on it. It will show you all of the features but it will have a section that says downloads. You go to that and it allows you to print the instructions so you can see what we are talking about.
Basically though you set your radio to FM then turn the ignition off. Next you press any two of the "Soft Keys" (Explained in the owners manual but it's the preset buttons) and keep them pressed as you turn the ignition to accessories position. When in the center display it says "Diag Test" you can let go of the two keys and then press the #4 key which should say "software". That process will show you two files in the center display. and both files should read v.8.9 if the latest download has been done to your radio.
I hope this helps you some.