Fix: Update your GPU drivers. For older GPUs, switch to gpuOgl.dll instead.
Fix: Ensure your ROM is decrypted. Demul does not support encrypted NAOMI dumps. Use a tool like NAOMI Unencryptor if needed. demul mpr21931ic501 2021
Do not use the ancient 0.5.x versions. Search for Demul v0.7-28022020 or a branded "2021 Community Edition." Look for builds that explicitly mention "PIC bypass" or "security fix." Fix: Update your GPU drivers