Can GBA insertion be done before beating the game?

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GBA Cartridge Slot FFC Extender Just a simple board which allows you to extend your GBA's cartridge slot to another PCB by using a 32 pin FFC

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hunt for neptune''s gold slot machine Gameboy Advance Download Slot-Pro Advance - Takarafune & Oedoshima Fubuki 2 emulator game and play the GBA ROM free Cross-platform game works on desktop Load the GBA game , then load the DS game If done correctly, the DS bios will have the option for Start GBA