it does since the gba hardware is also required for ds games which means any nintendo system that plays ds games has gba hardware in it including the 3ds.There is also not much to reverse. AGB FIRM just handles showing the video outputted from gba on screen and that's iy basically
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That's impossible. There is no way to redirect the gba bus without extra hardware. This is why gbarunner2 has to exist in the first place. Also, I'm not sure if a dsi actually still contains gba hardware.