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GBARunner2ー、公式ぬGBA BIOSぬダンプ使用し互換性向上しみーるくとぅがなやびーん。 ファイル名ーbios.binでぃあるしがいりゆーやいびーん。SDカードぬルート、sd:/gbaあらんでぃsd:/_gbaんかい配置なやびーん。

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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