I am currently looking how to properly play Mother 3. Anyways I just got my hands with an EZ Flash 4 IV and I all I can say is it's pretty cool with all the features that it includes. It supports lots of homebrews, modded GBA roms and all kind of original games back in the day. I purchased mine at emuflash com. Arrived a few days since I ordered one from them and superb service. You should really try EZ flash 4 from them. IMO the best flash card for gameboy advance put there at a very good price. 
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