PLEASE STOP ASK IF THIS METHOD WORKS ON X.X, CURRENTLY IT IS ONLY AVAILABLE BETWEEN 9.0 AND 9.2 (lower firmwares may be supported one day, but, without a new kernel exploit, there is no chances for 9.3+)
NEW 3DS METHOD
Its's very simple.
Launch NTR CFW on a New 3DS.
Enable the debugger.
Connect the debugger with the command : connect('your3dsip', 8000)
And now the magic command UPDATED (may not work on 8.1J) :...
[How-to] Spoof firmware (to access eShop and more) on New 3DS and Old 3DS
NEW 3DS METHOD
Its's very simple.
Launch NTR CFW on a New 3DS.
Enable the debugger.
Connect the debugger with the command : connect('your3dsip', 8000)
And now the magic command UPDATED (may not work on 8.1J) :...
[How-to] Spoof firmware (to access eShop and more) on New 3DS and Old 3DS