This is the iSmart MM flash cart patch update, you will need a full kernel ( http://filetrip.net/nds-downloads/flashcart-files/download-ismart-mm-kernel-update-20120323-f27425.html ) and then to update to this.
Instruction (assuming you have previously working full version)
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) on your SD card.