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GBARunner2 can use a dump of the official GBA BIOS to improve compatibility. The file must be named bios.bin and can be in the root of the SD card, sd:/gba or sd:/_gba.

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Make sure your GBA BIOS dump matches with the following CRC32 hash: 81977335

You can check this on this website:
simplycalc.com/crc32-file.php