Will the R4 Revolution Card Work on Nintendo DSi?

No. The original R4 Revolution (often called “R4 DS”) is incompatible with the Nintendo DSi.

Why It Fails

• Different firmware/bootloader: The DSi checks for a valid header and signature that the original R4 lacks.
• SDHC support: The DSi uses SDHC cards (4 GB+); the original R4 only supports standard SD (≤2 GB).
• Hardware encryption: DSi games and system software use encryption the old R4 can’t handle.

Flashcarts That Do Work on DSi

• R4i-SDHC / R4i Gold 3DS Plus: Budget-friendly, broad compatibility, regular kernel updates.
• DSTwo / DSTwo Plus: Onboard CPU for GBA/SNES emulation, real-time save, cheat engine.
• SuperCard DSTWO: Similar to DSTwo, excellent homebrew support.
• Ace3DS X / Ace3DS Plus: Cheap, works on DSi/3DS, supports microSD up to 128 GB.

Before buying: Verify the exact model matches your DSi firmware version (1.4.1–1.4.5) and region. Buy from reputable resellers (NDS-Card, ModChipsDirect, etc.) to avoid clones that brick consoles.