Well, you can update your R4i sdhc or R4i sdhc 3ds to V1.43b now.
With V1.43b firmware, you can use your R4i sdhc to work on your DSi V1.43 and also you can use R4i sdhc 3ds to work on both DSi V1.43 and 3DS 2.1.0-4.
To those who have R4i 3DS\R4i V1.41\R4i V1.42 card, the update of NDSi V1.43 have already been released, support NDSi V1.43 perfectly, please download the latest kernel to update your R4i card.
R4i V1.43b Update:
1. Firmware upgrade to support NDSI 1.43(for products 1.41,1.42, 3DS).
2. Integrate firmware upgrade features. Goto config menu for firmware upgrading.
3. Fix display bug of Korean language.
4. Solved games:
5804 - Harry Potter and The Deathly Hallows: Part 2 (EU)
5798 - Brainstorm Series Treasure Chase (US)
5797 - The Sims 3 (US)
5796 - Kung Fu Panda 2 (US)
5795 - Devil Survivor 2 (JP)
5786 - Red Stone DS: Akaki Ishi ni Michibikareshi Monotachi (JP)
5785 - The Smurfs (US)
5782 - Nora to Koku no Koubou: Kiri no Mori no Majo (JP)
5780 - Petz Bunnyz Bunch (US)
5776 - Camp Rock: The Final Jam (US)
5769 - ATV Wild Ride (US)
5225 - Imagine: Resort Owner (EU)
R4i sdhc 3DS V1.42b
R4i sdhc V1.42b