

The trick doesn't seem to work with the new 3DS models just released in Japan, Europe and Australia, because the new devices seem to have patched the vulnerability. The in-game saving mechanisms of the sideloaded games won't work, but users can use the Virtual Console's own save-state feature to save their progress. The trick works by essentially replacing the eShop-purchased game with the sideloaded ROM. Then, on a SD card, place the ROM for the GameBoy or GameBoy Color game you want on your 3DS, as well as the exploit code (the link to the file is in the YouTube description), and put the SD card into the 3DS's card slot. The game has to be at or less than 1 MB in size. Pulling off the trick requires users to legitimately purchase at least one GameBoy Color game from the Nintendo eShop.
