: Place naomi.zip in the /system/dc/ folder (the "dc" stands for Dreamcast, the NAOMI's home-console cousin).
— possibly from a corrupted filename, a test string, or an internal code snippet.
The BIOS file is corrupted or from a different region. Solution: Re-dump your BIOS from a known working console. Use md5sum or sha1sum to compare against known good hashes (available on emulation wiki sites).
