HOW TO:
1) Choose a rom with the firmware you need (check here : http://3ds.essh.co/ ). If you want 9.4.0-21, for example, you can use "Super.Smash.Bros.USA.READNFO.3DS-BigBlueBox"
2) Get the chosen rom with the same region as your 3DS (japanese 3DS = japanese rom ; american 3DS = american rom) ; european 3DS = european rom, etc...). In my example, I have a USA 3DS so I usd the USA "Super.Smash.Bros.USA.READNFO.3DS-BigBlueBox" rom.
3) Before clicking on "Nintendo DS Profile" to launch the Emunand, press and hold "up" on the D-PAD and keep holding it until the emunand is loaded (No need to hold "L" if you already installed/formated the emunand. The "L" button is just here to trigger the Gateway GUI if you need it).
4) Be sure to desactive the Wi-Fi with the switch on the right side of your 3DS, better be safe than sorry. Then, use the "Select" button to choose and launch the rom. Try to start the game and it'll prompt you for a firmware update. Accept it.
5) Once the update is over, it'll bring you back to the System Nand, which will still be in 4.x (in my example : 4.4.0-10u).
Launch the emunand again (this first boot after the update will be longer, as it need to configure some things, like the Miiverse for example), and check in the settings, you should be in GW3D X.X.X (in my example : GW3D 9.2.0U)
VIDEO TUTORIAL by ME as well ^_^
https://www.youtube.com/watch?v=tLaff6l ... 4DBY2sNl7I
when i made this video the latest firmware was not supported by gateway, so this info is good for those situations
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