The Sega Dreamcast BIOS is proprietary software owned by Sega. It is protected by copyright law.
While the boot file contains the system code, the dc_flash.bin file represents the Dreamcast's internal storage (settings, time, language). Without this file, users may encounter error screens or be unable to save settings. It is possible to generate a blank flash file within Flycast, but using a dumped file ensures proper language and region defaults. dreamcast bios for flycast
Note: While filenames can sometimes be configured, utilizing the standard naming conventions ( dc_boot.bin and dc_flash.bin ) ensures the highest success rate for automatic detection by the emulator. The Sega Dreamcast BIOS is proprietary software owned