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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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You can use our guide on the DS Homebrew wiki to learn how to dump it yourself:
wiki.ds-homebrew.com/gbarunner2/bios-dump

Otherwise, ensure it matches the CRC32 hash of 81977335, which you can do by uploading your dump to the following website:
simplycalc.com/crc32-file.php