R4i-SDHC 3ds kernel updated to V1.43b .If you want to know more details about r4i sdhc 3ds,you can go to gamehouse88.com.
R4i SDHC card blocked by DSi V1.4.3, what can I do?
R4i SDHC card can't work with DSi 1.4.3 at present,you have to wait till R4i SDHC release new upgrade patch for DSi 1.4.3.. You need to stay tune for the latest news.
you can update the r4i sdhc kernel to latest version, and use a ds or dsi (below v1.4.3) to upgrade the r4i sdhc card. Then problem can be fixed.