I know that you are supposed to unlink your nands or you won't be able to use the eshop. With that being said, I tried to make my NNID on my system before doing the downgrade, only to find out I need to update(atleast on sysnand) If i have never had a NNID, Could I do the downgrade on the sysnand to 4.2 and make a new NNID on the Emunand?