: In the app settings, you must manually select bios7.bin , bios9.bin , and firmware.bin for the DS core to activate.
Note: The standard DS BIOS files ( bios7.bin and bios9.bin ) are different from the DSi versions and are required for standard DS emulation. dsi bios files download link
The following sites are known to host these files. Be sure to check the file names and sizes after downloading to ensure compatibility with your emulator. : In the app settings, you must manually select bios7
: A highly reliable repository that includes the DSi NAND and firmware files. : In the app settings