What to Know Before Modding Your Nintendo DSi

Updated

Before you start, know this: modding a DSi is low-risk, but not zero-risk. The only step that can brick the console is installing Unlaunch, and the DSi Guide describes that risk as minimal. Everything else in the process — setting up an SD card, using an entry point like Memory Pit, and running homebrew — does not carry a brick risk. You should also read every introductory page of the guide before touching your console, and if you are on Windows, turn on file extensions in File Explorer so you can see exactly what files you are copying.

What you need before starting

  • A Nintendo DSi console. Homebrew runs on all DSi consoles regardless of firmware version or region.
  • An SD card. This stores your homebrew and is required for the main entry point used in the guide.
  • An entry point. The guide's primary method is called Memory Pit. If Memory Pit is unusable for your setup, the guide notes that other entry points exist.
  • A Windows PC (optional but common). If you use the default File Explorer, enable "show file extensions" so file names are not hidden from you.

No flashcard is required to run DS(i) game backups or ROM hacks from the SD card.

The one real risk: Unlaunch

Unlaunch is the only installation step that can brick a DSi, and the guide characterizes the risk as minimal. Treat this as the step to slow down for: read the relevant page fully, follow it exactly, and do not skip ahead. If you are not comfortable with that single risk, you can still use homebrew through an entry point without installing Unlaunch.

What modding actually gets you

The guide lists these capabilities, which help you decide whether the effort is worth it:

  • Run Nintendo DS(i) game backups or ROM hacks from the SD card without a flashcard
  • Launch any DSiWare from the SD card, including out-of-region and 3DS-exclusive titles
  • Boot into DSiWare or homebrew by holding specific buttons at power-on
  • Run emulators for older consoles
  • Use normally incompatible flashcards
  • Redirect NAND to the SD card with hiyaCFW
  • Play movies with FastVideoDSPlayer or tuna-viDS (FastVideoDSEncoder requires a CPU with AVX2 support, which most newer CPUs have)
  • Show a custom boot splash image at system launch
  • Play homebrew games

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.

Your next step

Work through the guide's introductory pages in order, then continue to its Get Started section. Doing the reading first is the main thing that keeps the Unlaunch step low-risk.