2021 — Naomizip

The Flycast core became the go-to for NAOMI/Atomiswave/Dreamcast emulation, often outperforming older methods.

As of 2021/2022, the most reliable naomi.zip files are derived from the MAME ROM set , specifically newer sets (0.236 and later) which contain the necessary, updated files to handle different game revisions, such as the Japan or Export versions. Why 2021 Was a Pivotal Year for NAOMI Emulation naomizip 2021

This typically indicates that while the BIOS is found, the game cannot boot, often due to improper ROM formatting or missing regional files. Ensure you have the naomi.zip from a recent MAME set, as older sets are incompatible. the game cannot boot

Which are you using (e.g., Flycast in RetroArch, MAME, Redream)? Flycast in RetroArch