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Installing boot9strap (kartdlphax) -

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-Technical Details (optional) - -

In order to install custom firmware on our console, we need to get Homebrew Launcher access.

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To accomplish this, we can use the Download Play functionality of the game Mario Kart 7, using a 3DS with custom firmware already installed along with a custom game plugin.

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This custom plugin will send a hacked payload to an unhacked console, which then exploits the system in order to inject menuhax67, which will allow us to get Homebrew Launcher access.

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Once we have Homebrew Launcher access, we can run nimdsphax to install boot9strap.

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See here for information about kartdlphax, here for information about menuhax67, and here for information about nimdsphax.

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Compatibility Notes

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In order to follow these instructions, you will need the following:

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  • A second 3DS with custom firmware (the source 3DS) that is the same region as the 3DS you are trying to modify (the target 3DS) -
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    • The consoles must be USA, JPN, or EUR region consoles
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    • The source 3DS can be region changed to match the target 3DS if necessary
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  • A physical or digital copy of Mario Kart 7 that is the same region as both consoles
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  • An SD card for both consoles
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What You Need

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Section I - Prep Work (source 3DS)

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In this section, you will set up your source 3DS (the 3DS with custom firmware) for delivery of the exploit data to the target 3DS.

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  1. Insert the SD card of your source 3DS in your computer
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  2. Copy boot.firm from the Luma3DS .zip to the root of the source 3DS’s SD card, replacing any existing file -
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    • The root of the SD card refers to the initial directory on your SD card where you can see the Nintendo 3DS folder, but are not inside of it
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  3. Copy kartdlphax’s plugin.3gx to the following directory on the source 3DS’s SD card, depending on the region of your copy of Mario Kart 7: -
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    • USA: /luma/plugins/0004000000030800
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    • EUR: /luma/plugins/0004000000030700
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    • JPN: /luma/plugins/0004000000030600
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    • Create the plugins and 00040000... folders if they do not already exist
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  4. Eject the SD card and put it in the source 3DS
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Section II - Prep Work (target 3DS)

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In this section, you will set up the files that the target 3DS will need to install custom firmware.

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  1. Insert the SD card of your target 3DS in your computer
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  2. Copy boot.firm and boot.3dsx from the Luma3DS .zip to the root of the target 3DS’s SD card
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  3. Create a folder named boot9strap on the root of your SD card
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  4. Copy boot9strap.firm and boot9strap.firm.sha from the boot9strap .zip to the /boot9strap/ folder on your SD card
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  5. Copy SafeB9SInstaller.bin from the SafeB9SInstaller .zip to the root of your SD card
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  6. Create a folder named 3ds on the root of your SD card if it does not already exist -
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    • This folder stores homebrew applications and data; it is different from the Nintendo 3DS folder that the console automatically generates
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  7. Copy the nimdsphax folder from the nimdsphax .zip to the /3ds/ folder on your SD card
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  8. Copy menuhax67_installer.3dsx from the menuhax .zip to the /3ds/ folder on your SD card
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  9. Copy Launcher.dat from the folder for your model and region inside the menuhax .zip to the root of your SD card
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  10. Eject the SD card and put it in the target 3DS
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Section III - kartdlphax

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In this section, you will use Download Play to transfer the exploit data from the source 3DS to the target 3DS, which can be used to install menuhax67, a Homebrew Launcher entrypoint. Your HOME Menu settings will be temporarily inaccessible on the target 3DS while this exploit is active.

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  1. Power on the source 3DS -
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    • If you are prompted to set up Luma3DS, just press START to save the configuration
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  2. Once in the HOME Menu, press (Left Shoulder) + (Down D-Pad) + (Select) to bring up the Rosalina menu
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  3. Select “Enable plugin loader”
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  4. Press (B) to exit the Rosalina menu
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  5. Launch Mario Kart 7 -
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    • Ensure that wireless connectivity is enabled
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  6. Navigate to Local Multiplayer. A menu should pop up -
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    • If the screen freezes, hold the power button for fifteen seconds to force power off your console, then try again
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    • If you have launched kartdlphax previously, the last selected settings will be loaded. If they are correct, select Use settings and skip the next 3 steps. If they are incorrect, select Change settings and proceed.
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  7. Select your target 3DS console type (Old 3DS family or New 3DS family)
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  8. Select the following exploit type depending on your system version: -
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    • 11.16.0: select xPloitInjector (11.16)
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    • 11.17.0: select xPloitInjector (11.17)
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  9. A confirmation menu will show up. If the settings shown on the top screen are correct, select Use settings -
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    • If the settings are not correct, press Change settings and modify them accordingly
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  10. Select Create Group - -
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  11. Power on the target 3DS -
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    • Ensure that wireless connectivity is enabled
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  12. On the target 3DS, open the Download Play application (), then select “Nintendo 3DS”
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  13. Join the group created by the source 3DS
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  14. Select “Start” on the source 3DS once it has detected the target 3DS
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  15. Once multiplayer has loaded, navigate to Grand Prix -> 50cc -> (any driver) -> Mushroom Cup -> OK
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  16. Wait a while (a percentage should be displayed on the source 3DS)
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  17. If the exploit was successful, the target 3DS will have booted into the 3DS ROP xPloit Injector -
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    • If the exploit was not successful, power off the source 3DS and target 3DS and start again from the beginning of Section III - kartdlphax
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Section IV - Installing menuhax67

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  1. Press (Y) + (D-Pad Down) to install menuhax67 -
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    • The console will automatically power off
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  2. Power on your console
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  3. Tap on the small HOME Menu settings icon in the top left of the bottom screen () -
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    • If the console freezes for a while and then crashes, make sure you have Launcher.dat on the root of your SD card
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  4. If the exploit was successful, your console will have booted into the Homebrew Launcher
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  5. Launch nimdsphax from the list of homebrew
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  6. If the exploit was successful, you will have booted into SafeB9SInstaller -
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    • If your console freezes on a red screen, hold the POWER button until it turns off, then try running menuhax again by powering on your console and tapping on the HOME Menu settings icon
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Section V - Installing boot9strap

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In this section, you will install custom firmware onto your console.

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  1. When prompted, input the key combo given on the top screen to install boot9strap - -
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  2. Once it is complete, press (A) to reboot your console
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  3. Your console should have booted into the Luma3DS configuration menu -
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    • Luma3DS configuration menu are settings for the Luma3DS custom firmware. Many of these settings may be useful for customization or debugging
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    • For the purpose of this guide, leave these options on the default settings (do not check or uncheck anything)
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    • If your console shuts down when you try to power it on, ensure that you have copied boot.firm from the Luma3DS .zip to the root of your SD card
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  4. Press (Start) to save and reboot
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Section VI - Removing menuhax67

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In this section, you will use the Homebrew Launcher to remove menuhax67, which will let you access the HOME Menu Settings option normally.

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  1. Launch the Download Play application ()
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  2. Wait until you see the Nintendo 3DS and Nintendo DS buttons
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  3. Press (Left Shoulder) + (D-Pad Down) + (Select) at the same time to open the Rosalina menu
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  4. Select “Miscellaneous options”
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  5. Select “Switch the hb. title to the current app.”
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  6. Press (B) to continue
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  7. Press (B) to return to the Rosalina main menu
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  8. Press (B) to exit the Rosalina menu
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  9. Press (Home) to suspend Download Play
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  10. Press the “Close” button on the bottom screen to close Download Play
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  11. Re-launch the Download Play application
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  12. Your console should load the Homebrew Launcher -
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  13. Launch menuhax67_installer from the list of homebrew
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  14. Select REMOVE menuhax67
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  15. When you see “done.”, press (A), then press (A) on “EXIT to menu”
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At this point, your console will boot to Luma3DS by default.

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  • Luma3DS does not look any different from the normal HOME Menu. If your console has booted into the HOME Menu, it is running custom firmware.
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  • On the next page, you will install useful homebrew applications to complete your setup.
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Continue to Finalizing Setup

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