GW will use your EMU nand. However. I HIGHLY recommend going the A9LH route. Installing A9LH through the guide will copy your EMU nand over to your SYS nand. Then IF you like, you can run Gateway at launch on your system nand. Everything will function faster. A9LH loads at boot so is way cleaner and has some brick protection like bootmii if you had a wii. it works on latest firmware. Its the way to go. If I were you right now I would think about maybe an amiiqo and a R4I Gold RTS and a BIG internal SD for your 3ds. Probably best case scenario and you can use all functions of the 3ds. Load 3ds games off internal through A9LH and DS through r4i, and emulate Amiibos with the amiiqo. EVERYTHING covered.