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

Prototypes by system/Game Boy Advance - Hidden Palace

Prototype GBA BIOS

Prototype GBA BIOS

Didj gpSP GBA Emulator

New Prototype DS Lite Discovered - The Independent

Game Boy Advance / Useful Notes - TV Tropes

cohost.org/lunasorcery on X: Looks like the prototype GBA BIOS

Prototypes by system/Game Boy Advance - Hidden Palace

Proto:Nintendo DS/ver.40820D - The Cutting Room Floor

Prototype GBA BIOS