What Is Homebrew and What Do I Need to Run It on a Nintendo DSi?

Updated

Homebrew is unlicensed software made for closed systems like the Nintendo DSi, ranging from utilities to custom games. It runs for free on every Nintendo DSi console regardless of firmware version or region, and all you need is an entry point plus an SD card to store the applications. The DSi Guide uses Memory Pit as its main entry point, with other options available if Memory Pit is unusable for your system.

What Counts as Homebrew

Homebrew applications are programs written for hardware that normally only runs officially licensed software. On the DSi, that covers a wide range: small utilities, emulators, media players, and full homebrew games. Because they are not distributed through Nintendo's storefront, they are loaded through a separate path — the entry point — rather than installed like DSiWare.

What You Need Before Starting

Two things are required, and nothing else:

  • An entry point — the method that lets the DSi launch unofficial code. The guide's primary entry point is Memory Pit; alternatives exist if Memory Pit cannot be used on your console.
  • An SD card — where your homebrew applications live and from which they are launched.

The guide states that homebrew can be run for free on all DSi consoles, so there is no paid step to get started. It also notes that the only brick risk in the whole process comes from installing Unlaunch, and that this risk is minimal.

What Modding Unlocks

Once homebrew is running, the DSi Guide lists these capabilities:

Capability What it means in practice
DS(i) game backups and ROM hacks Run them from the DSi SD card without a flashcard
Launch any DSiWare from SD Includes out-of-region and 3DS-exclusive DSiWare
Button-based boot Hold specific buttons at power-on to boot into DSiWare or homebrew
Emulators Play classic games from older systems
Flashcard compatibility Use normally incompatible flashcards
NAND redirection Send NAND to the SD card using hiyaCFW
Video playback Watch movies with FastVideoDSPlayer or tuna-viDS
Boot splash Display an image on system launch
Homebrew games Play games made for the system

One hardware caveat from the guide: FastVideoDSEncoder requires a CPU supporting AVX2, which newer CPUs will likely have.

Where to Find Homebrew

  • Universal-DB — most modern homebrew, with search and sorting to track recent updates.
  • GameBrew — a large collection of older homebrew, though much of it only works on flashcards.

Practical Notes Before You Begin

  • On Windows, the guide recommends showing file extensions if you use the default File Explorer — this matters when placing files on the SD card with the correct names.
  • Read all introductory pages of the guide, including the first one, before proceeding; the instructions assume that context.
  • If you want guides for homebrew and custom firmware on other devices, the guide points to CFW.Guide.

The natural next step is the guide's Get Started section, which walks through preparing the SD card and using Memory Pit.