So I just got Pokémon USUM and whenever I click the title to play it, it tells me to update to 11.4. I would like to stay on 11.2, so is there a way I can circumvent the update check and play USUM on 11.2?
I presume you don't want to update in order to use a Gateway 3DS card.
However it is Gateway 3DS related or not, you can partially update your Nintendo 3DS to 11.6.
This way your system will still be based on 11.2 (and Gateway 3DS still will work) but you can launch the newest games.
Unfortunately, I cant give you a direct link but Google for "Nintendo 3DS GATEWAY Emunand on lasted firmware 11.6.0-39".