The r4i sdhc official (www.r4isdhc.com) update the firmware to v3.5b. You can download it from official site. The R4i cards can support to 3DS v8.1.0-19, this new firmware should improve the game stability, provide users a perfect exprience.
R4i SDHC dual-core, R4i SDHC rts lite, R4i gold pro are three hot card, the official site keep updating the firmware, they can supports 3ds/2ds v8.1.0-19/DSi v1.45/NDS with latest kernel pefectly, R4i sdhc series is popular in Europe, especially R4i SDHC dual-core, many gamer choose it, it is a powerful r4 card in all the flashcart.
Second one is R4i SDHC rts lite. This card support real time save, it is the only one support this function among r4i sdhc series.
Third one is R4i gold pro, its packing is golden, very beautiful. All r4i sdhc series has special packing, different from other flashcart.
There are some great card except R4i sdhc series, such as supercard DStwo, R4i gold 3ds rts, R4i sdhc 3ds rts. Gamer from different place perfer different card, just choose one you like best.