This is a classic emulation issue. Some emulators like need separate BIOS (Basic Input/Output System) files to function, especially for DSi emulation. If these files are missing, misnamed, or in the wrong folder, you can see DSi-related errors. The required DSi files are often bios7.bin , bios9.bin , firmware.bin , and nand.bin . Even a small difference in naming—like having biosdsi7.bin instead of dsi_bios7.bin —can break the emulation.