Recovering Deleted Games from Action Replay DSi: Impossible

Impossible. The Action Replay DSi is a cheat cartridge—it does not store game ROMs or saves. It patches game code in RAM. When you delete a DSiWare game from System Settings, it's erased from the DSi's NAND (or SD card if moved). The Action Replay has zero access to that storage.

Recovery Options (All Long Shots)

• Redownload: Nintendo DSi Shop closed 2017. Cannot redownload.
• NAND backup: If you made one via homebrew (fwtool, GodMode9 on 3DS in DS mode), you could restore it. Extremely rare.
• 3DS eShop versions: Some DSiWare titles were ported. Also closed March 2023.

The Hard Lesson

Keep backups of your NAND/SD if you mod. Official DSiWare is permanently delisted. No recovery path exists through Action Replay or Nintendo support.