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

Surface Mount SMD Fuse: Game Boy Advance SP F1 F2

Game Boy Camera Flashcart, 2x1MB, FRAM

Ultra Rare Gameboy Advance Prototype Found! : r/retrogaming

Dolphin Emulator - mGBA Integration: Introducing the Integrated GBA

Gameboy Genius » Game Fighter

Dolphin Emulator - mGBA Integration: Introducing the Integrated GBA

Edge of Emulation: GBA Infrared Adapter

Emulador Dolphin - mGBA Integration: Introducing the Integrated GBA

Prototype GBA BIOS

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

Nintendo Lot Check ROM Leak - Retro Reversing (Reverse Engineering)

Nintendo DS Firmware 'Prototype' Reveals System's Unique Boot Up

WIFI Game Boy Cartridge