Finally nintendo published a new R4 which can compactible with NDSi and NDSL. That is R4i SDHC.                         

R4i-SDHC & R4-SDHC are SLOT-1 flash cards for NDS console series (R4i supports DSi). They are upgrade versions of R4 with multi-media features which can support SDHC and run most games and homebrews. They have widely been owned by many NDS player users.

R4-SDHC&R4i-SDHC is a multifunctional upgraded R4 version, which enjoyed a great reputation in global market. It not only maintain the previous functions, but also enlarged the capability, which can support SDHC.Check the following for comparisons between R4 and R4-SDHC.