Place naomi.zip (do not extract) into RetroArch\system\dc\ .
Naomizip 2021: The Essential Guide to Sega NAOMI Emulation and BIOS Setup naomizip 2021
For a stable experience with modern emulators, the naomi.zip file must be placed correctly. 1. RetroArch / Flycast Setup Place naomi
Obtain the latest naomi.zip from a modern MAME set. Flycast in RetroArch
Which are you using (e.g., Flycast in RetroArch, MAME, Redream)?
2021 saw continued improvements in NAOMI emulation through the in RetroArch, resulting in better compatibility and performance.
In late 2021, developers addressed issues regarding region settings, allowing users to better manage Japanese versus Export/US BIOS configurations.