The first and only Nintendo 3DS flash cart was released last month. Here is my take on it.
It works, mostly. You can put a Nintendo 3DS ROM on an SD card and play it via the Gateway cart. If you’re used to DS flash cartridges and their features you’re going to be in for some surprises though.
As of this writing the Gateway 3DS only works on firmware 4.5. If you’ve ever updated your 3ds you’re out of luck for now.
The Gateway 3DS only allows one rom per SD card. The SD card does not need to be the exact size of the ROM.
The Gateway 3DS does not run any homebrew yet. That means no emulators for SNES, GBA, ect.
The Gateway 3DS does not run DS games. You need a DS flash cart like the DSTWO for that.
The biggest problem is that games that utilize saves do not save once you take the cartridge out. Chew on the implications of that for a bit.
Sadly, that’s a whole lot of ‘does nots.’ Good news is that the makers of the Gateway have plans to resolve all of these problems in future firmware updates as the cartridge is upgradable.
In the meantime the Gateway 3DS is more of a proof of concept than a real usable flash cartridge.