I did a DSiWare downgrade from a 3DS #1 to 3ds #2, both are n3ds' and had their own NNID's. System formatted 3DS #2 so that Fieldrunners and the hacked save could transfer. Then, I followed Plailect's guide and got a9lh on 3DS #2. I didn't login to any NNID on 3DS #2 yet. I can't login on to the NNID on 3DS #1 anymore and I'm supposed to transfer back or call Nintendo in order to get it back. I called Nintendo twice asking them to unlink my NNID from 3ds #2, but they told me to system transfer back and I'll get my NNID back. But if I system transfer 3DS #2 back to 3DS #1, will both NNID's end up being linked to 3DS #1? In other words do system transfers cause all NNID's that have ever been associated with an account stay stuck on a console?