My son has a ndsl and it has an r4ttids cartridge with a 16 gb sdhc card. I have the latest firmware for the r4tti and all the games work on the console except Pokemon Black and when you try to launch the game it says fat error, but all the other pokemon games work. I sure would appreciate some helpful input on how to get this game working. You know how kids are one day there playing something for weeks at a time and the next day their playing something new. He has not played his ndsl for a while and he asked me to get pokemon black and white for him. I did and pokemon white works fine but pokemon black has the error I mentioned above. Thanks for some helpful input.