How to use
Download Launcher.dat from the repo (or compile it yourself) :
https://github.com/smealum/regionthree/ ... uncher.dat Copy Launcher.dat to the root of your SD card
Insert the game you want to run into your 3DS and power it up
Open the "Download Play" application
Hit the home menu button, but do not exit the Download Play application (keep it running in the background)
Open the Web Browser applet
Go to Gateway's exploit page (not linking directly to it here because not a fan of their whole piracy thing they've got going)
Wait a few seconds; screen should turn black and after a bit your game should boot up !
FAQ
Does this work on the latest firmware version ? Yes, 9.4 is supported.
Does this let me run homebrew and/or roms ? No, it just lets you run legit physical games from other regions.
Do I need to connect to the internet every time I want to use this ? Yes.
Do I need a flashcart/game/hardware for this ? No.
Will this work on my New 3DS ? No, at the moment this only works on 3DS, 3DS XL and 2DS models.
Will it ever work on the New 3DS ? Maybe. I don't plan on working on it, like, ever, but the code is out there now so...
Will this break or brick my 3DS ? No. There's virtually 0 chance of that happening, all this runs is run of the mill usermode code, nothing dangerous. Nothing unusual is written to your NAND, nothing permanent is done. With that in mind, use at your own risk, I won't take responsibility if something weird does happen.