The iSmart team have released a fix to make Kirby Mass Attack work in their iSmart MM card.
Fix for Kirby Mass Attack(U) (clean mode enabled, you will need a fast microSD)
1. Download the file.
2. Unzip it to your local hard drive.
3. Replace the two files (ndspatch.dat, savemode.dat under the folder _ismart) to your TF.
Download iSmart MM Game Patch