You can't register a nnid with updates blocked!
But I have good news!
This is what I've done:
1- I unblock updates! (so scared!)
2- I deleted my default user 8000003 (nooo!) selecting to not delete nnid!
3- Yeah, Haxchi is still there!
4- I linked the same nnid to new user 8000001!
5 Yuppi! Everything is perfect!
Thanks to everyone who helped =)
But I have good news!
This is what I've done:
1- I unblock updates! (so scared!)
2- I deleted my default user 8000003 (nooo!) selecting to not delete nnid!
3- Yeah, Haxchi is still there!
4- I linked the same nnid to new user 8000001!
5 Yuppi! Everything is perfect!
Thanks to everyone who helped =)