It seems you need a EZFlash Vi due to the fact you have a DSI. There are videos of it on YouTube and you can also have a read about it if you do a search for it on google. But you need to be under system software 1.4.3 I think it says, there may be a method to downgrade (sorry, I don't have more time to read up about it). The Gateway blue card isn't an R4 no, it's strictly to enable the playback of unsigned NDS roms using the hardware itself, that is all. R4 and similar flashcarts have an independent cpu/gpu built into them that they use for the emulation of GBA etc.. probably running off some sort of linux kernel. The EZFlash Vi seems to say it works very well for gba games and also nds games too. So I would start there and if you have any questions about it, I'd recommend sending the online store a question or even the manufacturer - it's what I've done before.