There is a new release for the R4 Card for NDS system. The new BIOS has some fixes for games.
Again as usual I had customized the package. This is much bigger than the official release though. I had included the US and EU Action Replay Cheat Codes as of 23 Feb 2008 into the user define codes sections. The original offical code is still there too. Anyway, just unpack the whole thing into your SD Micro from this package overwriting all.
This works for new SD Micro as well. Thats the beauty of R4.