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Installing boot9strap (Kartminer7) +

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For support in English, ask for help at Nintendo Homebrew on Discord.
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+Technical Details (optional) + +

To install boot9strap on your console, we derive your console’s unique encryption key. To accomplish this, we use a tool called Seedminer to calculate the data encryption key (movable.sed) for your console.

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Once we have movable.sed, we can edit the SD card data of the game Mario Kart 7 to install 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 Kartminer7, here for information about menuhax67, and here for information about nimdsphax.

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What You Need

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  • A physical or digital copy of Mario Kart 7 updated to the latest version (v1.2) +
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    • You can update Mario Kart 7 from eShop or by following the update prompt when you launch the game
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  • A Windows computer
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  • Your movable.sed file from completing Seedminer
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  • The latest release of Kartminer7
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  • The latest release of menuhax67
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  • The latest release of nimdsphax
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  • The latest release of Luma3DS
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Section I - Preparing Mario Kart 7 data

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In this section, you will have the 3DS generate some data in Mario Kart 7 that will be used to install the exploit in a later section.

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  1. Insert your SD card into your console
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  2. Open Mario Kart 7
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  3. Tap the “Mario Kart Channel” button on the bottom
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  4. If you are prompted to, hit “Next” and “OK” to all of the prompts that you see
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  5. Tap the “StreetPass List” button on the bottom of the screen, in the middle
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  6. Press the (Home) button to suspend Mario Kart 7
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  7. Disable wireless connections by flicking the wireless switch on the side of the console or by navigating to HOME Menu Settings (top left) -> Wireless Communication -> OFF
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  8. Power off your console
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Section II - SD Card Prep Work

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  1. Insert your SD card into your computer
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  2. Copy boot.firm and boot.3dsx from the Luma3DS .zip to the root of your SD card +
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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. 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 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 menuhax_manager.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. Keep your SD card inserted in your computer, as it is still required in the next section
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Section III - Installing Kartminer7

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  1. Extract the Release_BETA_mk7 .zip to somewhere on your computer (i.e. your desktop)
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  2. Copy your movable.sed file to the resources folder of the Release_BETA_mk7 folder +
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    • Ensure that the file is named exactly movable.sed
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  3. Open the backup folder inside of the Release_BETA_mk7 folder
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  4. Double-click on the BACKUP .bat file corresponding to your console’s region (e.g. backup_USA.bat if you have a USA copy of Mario Kart 7) +
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    • If you are unsure of your console region, you can check System Settings. U = USA; E = EUR, J = JPN
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    • If you get a message from Windows Defender, click “More info”, “Run anyway”, then press any key to continue
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    • If the backup was successful, you should see a new folder appear
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    • If you wish to restore this data at a later date (after finishing this guide), insert your SD card and double-click on the RESTORE .bat file corresponding to your console’s region
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  5. Go back to the Release_BETA_mk7 folder, then double-click on the .bat file corresponding to your console’s region (e.g. USA.bat if you have a USA copy of Mario Kart 7)
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  6. Reinsert your SD card into your console
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Section IV - Kartminer7

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  1. Power on your console
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  2. Open Mario Kart 7
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  3. Tap the “Mario Kart Channel” button on the bottom
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  4. Tap the “StreetPass List” button on the bottom of the screen, in the middle
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  5. Press (A) over and over again +
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    • The colours on the bottom screen should change from red, to blue, to white
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    • If you see the red/blue/white screens but the 3DS crashes, just reboot and try again
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    • If you don’t see ANY colours, change your system language (if possible), then try the exploit again
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  6. If the exploit was successful, the 3DS will have booted into the 3DS ROP xPloit Injector
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Section V - 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 VI - 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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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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Section VII - 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 menuhax_manager 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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Continue to Finalizing Setup

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