I've been using mine since this morning and it works fine for Pokemon Y and ACNL :S
I don't know what you guys are doing wrong but I've never once, not even once, ever has an 'Operation failed' error message and I've had this device since it was first announced. >_>
same here first day this happendI have to say that this is the first time this has happen to me saying the 'Operation failed' error message hope its back up soon
Any new codes then or is it still down? Im in work see otherwise I would check myself