Installing HiyaCFW

If you need help, ask the NDS(i)Brew Scene or the Nintendo Homebrew Discord servers.

You will need Unlaunch installed before proceeding.

Do not system update after installing HiyaCFW. This will remove HiyaCFW’s SD patches.

HiyaCFW has several advantages that only having Unlaunch on your system will not allow for. These include:

  • Booting the system from the SD card
  • Installing homebrew applications to the System Menu with ease
  • Including a custom splash screen on boot
  • Automatically booting into another application, such as DSiMenu++


  • [OPTIONAL, BUT RECOMMENDED] An SD card that is 2GB or smaller, or a larger SD card that is partitioned to be 2GB or smaller
  • The latest release of fuse-3ds
    • Windows users will need to install WinFsp as well
  • The latest release of OSFMount
    • This can be substituted for the mount utility on non-Windows systems
  • The latest release of HiyaCFW
  • NUSDownloader
  • A NAND backup taken from your device, with the NO$GBA Footer
    • fwTool 2.0 will create this footer automatically when it makes a backup
    • You should already have this backup from the previous section
  • HiyaCFW Helper
    • Windows users may use the .EXE
    • Users of other operating systems may use the .py (requires Python 3 and WINE)

HiyaCFW Preparation

  1. Insert your SDNAND SD card into your PC
  2. Copy the contents of the NUSDownloader .zip file to a folder on your PC
  3. Copy the contents of the HiyaCFW .7z file to a folder on your PC
  4. Copy the contents of the HiyaCFW Helper file to the for PC folder in your HiyaCFW folder
  5. Open NUSDownloader on your computer
    • This can be done through Mono on non-Windows systems
  6. Check the “Create Decrypted Contents (*.app)” box, and uncheck the “Keep Enc. Contents” box
  7. Select Database -> System (DSi) -> System Menu (Launcher) -> [Your Region] -> v512 -> Start NUS Download!
  8. Exit NUS Downloader
  9. Navigate to titles -> 00030017484e41XX -> 512 in your NUS Downloader directory
  10. Copy from the 512 folder to the HiyaCFW for PC folder
  11. Copy your valid NAND backup (nand.bin) from the FWXXXXXXXXXXXX folder on your SD card to the HiyaCFW for PC folder
    • XXXXXXXXXXXX denotes random, console-specific characters
  12. In the HiyaCFW for PC folder, run hiyacfw_helper.exe to prepare modifications
    • Non-Windows systems can use the .py file, which will require Python 3 and WINE

SDNAND Creation

  1. Open fuse-3ds on your PC
    • If fuse-3ds fails to open, check the FAQ
  2. In the - Choose a type or drag a file/directory here - dropdown, select Nintendo DSi NAND backup ("nand_dsi.bin")
  3. Drag and drop your valid NAND backup onto the file Drag a file here or browse... input box
  4. Create a new folder on your PC (NOT your SD card!) to mount the NAND backup on, and drag and drop this new folder onto the mount point Drag a directory here or browse... input box
    • Ensure that the mount type is set to “Directory” on Windows systems
  5. At the bottom of the fuse-3ds window, press “Mount”
    • The mounted folder will appear
    • If fuse-3ds fails to mount, check the FAQ
  6. Open OSFMount on your PC
    • The mount utility can be used instead on non-Windows systems
  7. At the bottom left of OSFMount’s window, press “Mount new…”
  8. In the new window, under “Image file”, navigate to your mounted NAND folder and select twl_main.img
  9. Press “OK”
    • A new mounted drive will appear
  10. Navigate to the new mounted drive on your PC
  11. Copy all contents of the new mounted drive to the root of your SD card
  12. In OSFMount’s window, select “Dismount all and Exit”, then press “Yes”
  13. In fuse-3ds’s window, select “Unmount”, and close fuse-3ds


  1. Copy the contents of the HiyaCFW for SDNAND SD card folder to the root of your SD card
    • If asked to replace any files, do so
  2. Open the Modified Files folder from the HiyaCFW for PC folder
  3. Copy bootloader.nds to the hiya folder on your SD card
  4. Copy to title -> 00030017 -> 484e41XX -> content folder on your SD card
    • XX denotes your region: 45 for USA, 50 for EUR, 4A for JAP, 55 for AUS
  5. Unplug your SD card, and insert it in your DSi
  6. Power on your console
    • HiyaCFW’s settings screen should appear
  7. Change the settings to your liking, and press (START) to continue
    • If you boot to “An error has occured” screen, it’s most likely because your SD card is larger than 2GB; follow Replacing System Menu with DSiMenu++ as noted at the top of the page

Your system will now boot from the SD card instead of the internal NAND. You may press (A) while booting to bypass HiyaCFW and boot from the internal NAND, using Unlaunch.

Continue to Finalizing Setup