---
title: "Installing boot9strap (MSET9)"
---

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<summary><em>Technical Details (optional)</em></summary>
[MSET9](https://github.com/zoogie/MSET9) is an exploit for the System Settings application developed by [zoogie](https://github.com/zoogie). It exploits a flaw where the ID1 (the second 32-character folder name inside of the Nintendo 3DS folder, inside of the ID0) can be *any* name as long as it is 32 characters. Performing a specific sequence of actions results in the console executing the instructions that are encoded into the ID1 folder name, which can be used to grant full control over the 3DS.

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<details>{{ technical_info | markdownify }}</details>
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### Compatibility Notes

This method requires a computer running Windows, Linux, or macOS. ChromeOS and Android devices have an app that is currently not covered here. iOS devices are not supported. If you do not have access to a computer, you will need to use an [alternate exploit](https://wiki.hacks.guide/wiki/3DS:Alternate_Exploits).
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### 必要なもの

* The latest release of [MSET9](https://github.com/zoogie/MSET9/releases/latest) (the Release `.zip` file)
* Any 3.x version of [Python](https://www.python.org/downloads/) **installed on your computer**
    + If you are on Linux or macOS, you may already have Python 3. Check by opening a Terminal window and entering `python3 -V`. If this returns a version number, it will work for this guide.

### 手順

On this page, you will use the MSET9 script, which is used to trigger MSET9. If you get a numbered error (e.g. Error 01) when running the script, the solution to that error can most likely be found on the [troubleshooting](troubleshooting#installing-boot9strap-mset9) page.
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#### セクション I - 準備

In this section, you will prepare the SD card data necessary for the MSET9 exploit to trigger.

1. Power on your console **with your SD card inserted**
1. Open Mii Maker
1. Wait for your console to reach the "Welcome to Mii Maker" screen, then exit Mii Maker
    + You may see [this screen](/images/screenshots/mset9/mii-extdata.png), which indicates the necessary data has been created
    + If you just reach the normal Mii Maker screen, exit Mii Maker and continue to the next step
1. Power off your console
1. パソコンにSDカードを入れます
1. Copy everything from the Release `.zip` to the root of your SD card, overwriting any existing files

    ![MSET9 root layout](/images/screenshots/mset9/mset9-root-layout.png)
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1. Run the MSET9 script:
    + **Windows**: Double-click `mset9.bat`
    + **macOS**: Double-click `mset9.command` and enter your password if prompted
    + **Linux**: open a Terminal window, `cd` to the root of your SD card, then type `python3 mset9.py` and press Enter

    ![Image: MSET9 setup](/images/screenshots/mset9/mset9-select.png)
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1. Type the number corresponding to your console model and version, then press Enter
    + The window should change to this:

    ![Image: MSET9 setup](/images/screenshots/mset9/mset9-setup.png)
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    + Ensure that the correct console model and version is displayed
1. Type `1`, then press Enter to ensure your console is prepared for MSET9
    + If you get an error, check the [troubleshooting](troubleshooting#installing-boot9strap-mset9), then try again
1. If you see the message "Everything appears to be functional!", MSET9 is ready to be injected. Press Enter to close the MSET9 script
1. Reinsert your SD card into your console
1. Power on your console

#### Section II - MSET9

In this section, you will trigger MSET9 to launch SafeB9SInstaller (the custom firmware installer).

These instructions must be followed **EXACTLY**, so double-check EVERYTHING you are doing to avoid errors!
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1. **[Hover over](/images/screenshots/mset9/hover-settings.png)** the System Settings icon using the D-Pad (do not select it yet)
1. Power off, then power on your console
1. Press (A) to launch System Settings
1. Navigate to `Data Management` -> `Nintendo 3DS` -> `Extra Data` ([image](/images/screenshots/mset9/settings-extdata.png))
1. **Do not press any buttons or touch the screen** - ensure that you see the Mii Maker icon
1. **With the console STILL ON, and without pressing any buttons or touching the screen**, remove your SD card from your console
    + The menu will refresh and say that no SD card is inserted, which is expected
1. パソコンにSDカードを入れます
1. Run the MSET9 script:
    + **Windows**: Double-click `mset9.bat`
    + **macOS**: Double-click `mset9.command` and enter your password if prompted
    + **Linux**: open a Terminal window, `cd` to the root of your SD card, then type `python3 mset9.py` and press Enter
1. Type the number corresponding to your console model and version, then press Enter
1. In the MSET9 window, type `2`, then press Enter to inject MSET9
    + You should see "MSET9 successfully injected!"
1. Press Enter to close the MSET9 script
1. Reinsert your SD card into your console **without pressing any buttons or touching the screen**
1. Exploitが成功すれば、SafeB9SInstallerが起動されます。 
    + If you get a red screen or the console gets stuck on a loading screen, follow the [troubleshooting guide](troubleshooting#installing-boot9strap-mset9)

#### セクション III - boot9strapをインストールする

{% include_relative include/install-boot9strap-safeb9sinstaller.txt %}
{%- include_relative include/configure-luma3ds.txt %}

#### Section IV - Removing MSET9

In this section, you will remove MSET9 to prevent further issues. (This will not remove the custom firmware that you just installed.)

Do NOT skip this section! If you skip it, applications may crash unexpectedly and you will encounter errors on the next page!
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1. Power off your console
1. パソコンにSDカードを入れます
1. Run the MSET9 script:
    + **Windows**: Double-click `mset9.bat`
    + **macOS**: Double-click `mset9.command` and enter your password if prompted
    + **Linux**: open a Terminal window, `cd` to the root of your SD card, then type `python3 mset9.py` and press Enter
1. Type the number corresponding to your console model and version, then press Enter
1. In the MSET9 window, type `3`, then press Enter to remove MSET9
    + You should see "Successfully removed MSET9!"
1. Press Enter to close the MSET9 script

{% include_relative include/luma3ds-installed-note.txt %}
___

Did you follow Section IV (Removing MSET9)? That section is MANDATORY!
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[セットアップを完了する](finalizing-setup) へ進みます
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