The software or flash cart firmware is trying to load a specific ROM file named 463 mk3 ultimate.u64 , but it cannot find it on your SD card, hard drive, or in the emulator’s virtual file system.
Happy retro gaming – and may your N64 never red-screen again. 463 mk3 ultimate.u64 not found
If you think you have the right files but the error persists, use MAME's built-in audit tool. The software or flash cart firmware is trying