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

Star Wars USA

Nintendo Game Boy Advance SMD Cap Kit - GBA

Prototypes by system/Game Boy Advance - Hidden Palace

State of the Analogue Pocket – November '22

Prototype GBA BIOS

Play Game Boy Advance Games on Other Devices- Dr.Fone

The Wonderfully Nostalgic Season of Gaming – UnderLevelled

Altered GBA BIOS ? - The Independent Video Game

Prototypes by system/Game Boy Advance - Hidden Palace

08, June, 2021

Prototype GBA BIOS

Game Boy Advance / Useful Notes - TV Tropes