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This indicates the emulator loaded gb.bios.bin , but the logo check failed. The file is either corrupted or you are trying to play a ROM with a header mismatch. Try disabling "BIOS logo check" in your emulator's settings as a temporary fix.
Without it, you miss the classic startup sequence that defined many childhoods.
Not a standard file. Proceed with extreme caution.
Modern emulation is moving away from proprietary BIOS files. The emulator, for example, has a "Bootrom Replacement" feature so accurate that it even mimics the exact timing of the logo scroll. The mGBA core can boot without a BIOS by simulating the hardware startup state.
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