BIOS file names are case‑sensitive. Ensure that the files are named exactly:
If it says "Missing," double-check the file names. It is almost always a capitalization issue ( dc_boot.bin vs DC_BOOT.BIN ). dreamcast bios missing emudeck work
The EmuDeck cheat sheet is an invaluable resource that lists expected BIOS names and locations for every supported system. Bookmark it and refer to it whenever you need to add BIOS files for a new console. BIOS file names are case‑sensitive