I too have an AK 2i and cannot get my M3 GBA Expansion card to work. I go to the top menu, where MicroSD Card and Slot2 Card is the only options. I select Slot2 Card and get this "Error No GBA Card". I then press the START button and scroll to the "More->" and press A button. Then there is an option to select "3in1/FAS1", so I select it and get this "3in1/EWin/FlashAdvance not found!" I also highlighted the Slot2 Card in the top menu, and press START, scroll to Properties, press A, and get some more options, Boot Slot2 Device, press A to Boot in GBA mode, press L+A to Boot in NDS mode (PassMe). Need less to say, what ever I try, still no joy! I do have GBA roms in the Games folder, that do not appear when browsing NDS roms.