Prototype GBA BIOS

No clue where I picked this up, but it's definitely strange. In addition to the changed sound, using this BIOS causes minor graphics corruption in some game

Myretrogamecase

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This Game Boy Advance DX - i think I may have bought a rare

Game Boy Advance Architecture

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Prototypes by system/Game Boy Advance - Hidden Palace

Nintendo DSi Prototype (23/5/2008) SDK 6291 : Nintendo : Free