: It saves system-level data like your username, internet settings, and photos taken with the DSi camera.
This tool is intended for development and testing purposes. It creates a bare-bones NAND image that is functional in emulators like melonDS, but it will lack any unique data from a real console, such as your personal settings or previously purchased DSiWare titles. Keep in mind that while this is a technical option, the NAND file it generates may have more compatibility issues than a genuine dump.
Right-click your nand.bin file on your computer, select Properties , and ensure the Read-only attribute checkbox is unchecked. nand.bin melonds
: Set the emulator to "Boot from firmware" (or DSi mode) to reach the DSi Menu instead of launching a game directly. 5. Managing NAND Content The size of a is typically around
| Error Message / Symptom | Likely Cause | Solution | |-------------------------|--------------|----------| | “Firmware not found” | bios7.bin or bios9.bin missing | Add the DS BIOS files. DSi mode still needs DS BIOS for backward compatibility. | | “Failed to load NAND” | Path to nand.bin is incorrect or file permissions error | Re-check the path in Config → Emu Settings. Run melonDS as administrator once to test permissions. | | melonDS crashes on DSi boot | Corrupted NAND dump or wrong size (must be 256MB or 512MB) | Re-dump your NAND using a reliable tool. Ensure your SD card has no bad sectors. | | “The saved data is corrupted” in DSi game | Mismatched console-unique keys in NAND | This happens when using a NAND from another DSi. Only a personal dump fully works. | | Wi-Fi doesn’t work in DSi mode | Missing nand_mac.bin or incorrect encryption | DSi Wi-Fi requires a valid MAC. Use your dumped nand_mac.bin or let melonDS generate a random one (less reliable). | : It saves system-level data like your username,
To load the interactive DSi home menu, boot DSi-enhanced cartridges, or play DSiWare, melonDS requires a raw backup of the physical system's flash memory, known as the nand.bin file. This guide explains everything you need to know about setting up, acquiring, managing, and troubleshooting the DSi NAND in melonDS. 1. What is nand.bin?
: To add games to your nand.bin , stop the emulation and go to System -> Manage DSi Titles . You can import .nds or .dsi files directly into the NAND here. Use the "Download from NUS" option to automatically pull the correct metadata and icons for the DSi home menu. Keep in mind that while this is a
Conclusion In melonDS, nand.bin is the emulated internal flash storage image that enables accurate system behavior, persistent system data, and support for firmware-dependent titles and homebrew. For best results and to remain on the right side of legality and safety, users should create nand.bin by dumping it from their own hardware and supply the emulator with any required firmware and keys.
melonDS primarily uses NAND in DSi (Nintendo DSi) emulation mode; standard DS emulation does not need or use a NAND image.