Download r4.html from www.r4ds.cn on your computer and unpack the zipped folder. Place all files in one folder. Then load your micro SD card on your computer. Now open up your micro SD and open the folder. Drag the files you downloaded in your micro SD card. Now create a new folder named games in your card. Then go to nds-roms.com. Download any game and drag that game file in your games folder. Now remove your SD card and put it in your R4. Now you can play all Nintendo games on your R4 DS. Enjoy!!!