This is the most sensitive part of the guide. You must dump nand.bin from a Nintendo DS or DSi that you physically own.
Earlier emulators (and melonDS in its earlier versions) focused primarily on the Nintendo DS (the original "phat" and Lite models). These consoles had very minimal firmware requirements. However, the Nintendo DSi was a significant hardware revision featuring a different processor architecture, an SD card slot, and a robust internal OS. nand.bin melonds
: After setting up the nand.bin file in MelonDS, you should be able to run games and applications that require NAND storage functionality. This is the most sensitive part of the guide