Things You'll Need
Instructions
Purchase the DS iPlayer or DSTWO SuperCard.
Download GBADSI_v1.zip. Unzip the folder to the desktop.
Place the SD micro card into the iPlayer/DSTWO card. Slide the iPlayer/DSTWO card into the SD Card reader on the computer.
Copy the entire GBADSI/plugins folder from the GBADSI_v1 folder into the "system" folder of the iPlayer/DSTWO card.
Copy GBA ROM files into the "system/plugins/NDSGBA/gamepack" folder in the iPlayer/DSTWO card and disconnect from SD card writer.
Place iPlayer/DSTWO card in the DSi and turn it on. Select Homebrew from the iPlayer/DSTWO menu.
Click on GBA.PLG. This will start the GBA emulator.
Select "New" and choose the ROM you would like to play.