Nintendo data transfer from new 3ds to 3ds?

Hi, I bought a Nintendo 2ds and now I want to transfer the Nintendo Network ID and the data from my new nintendo 2ds xl. Unfortunately I can't get it, because it is always not possible to transfer from a new 3ds system to a 3ds system.
Is there a way to deregister the ID on the new 2ds xl and register on the other without losing the data?

Why do you want to do that

And that is not possible i don't know why

So far I'm already knowing that it is not possible.