It says on the site that it is compatible on DS 1.4.3. I did download the latest kernel for my r4iSSDHC. but still. My DSi cant read the card. But my DS lite can read it though. please help me.
Just as Freudian said, the problem happeds because your card can not support DSi V1.43, you need to use your DS console to update it first. At first, need to know which R4i sdhc flashcard do you have, what is the site printed in the card, is it r4i-sdhc.com , if it is , then just come here: http://r4i-sdhc.com/downloade.asp and download the correct firmware(Note, they have 3DS version and V1.43 verison, just choose the right one which you have) and run it in your DS console to update your r4i sdhc to support DSi V1.43 . if this is not your r4i-sdhc, then find the correct official site and correct firmward to update.
