Ensure Windows isn't hiding extensions (e.g., your file isn't actually named dc_boot.bin.bin ).
Even if you have the files, they won't work if they aren't named correctly or placed in the right folder. Step 1: Correct Naming Convention sega dreamcast bios files work
Emulators are case-sensitive and programmed to look for specific filenames. If your files are named bios.bin or flash.bin , rename them exactly as follows: dc_flash.bin Step 2: Proper Folder Placement Ensure Windows isn't hiding extensions (e