installed
Just follow these simple steps:
1) Copy the Gateway 3DS 3.2.0 ULTRA Launcher.dat to your New 3DS microSD card
2) Copy mset_<region>.cia to your New 3DS microSD card (where <region> is your console region)
3) Copy “DevMenu.3ds” to your Gateway 3DS microSD card.
4) Boot into the Gateway...