I have to admit I am a little lost. I have just received the TED 2.4 and have a US Turbo Duo. How does loading the Super System Card 3.0 "damage" the Turbo Duo?
The information is all detailed in the first few posts in this thread, as is the "solution" in the form of a simple patch to apply to the System Card 3 image.
I'm sorry, but I don't know how to explain it in any simpler terms than it's already been explained ... it's a technical issue, and so it does sort of help to have some understanding of electronics.
BTW ... if you actually the thread, I think that you'll find that I was careful to say "potential damage". Your Turbo Duo isn't going to explode if you don't use the patch, but you're stressing the electronics when there is bus-fighting.
It's totally up to you if you want to risk that just to avoid applying a free patch (that even includes the source code so that you can see exactly what it is doing).