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

{% include toc title="Tabla de contenidos" %}

{% capture technical_info %}
<summary><em>Technical Details (optional)</em></summary>
For technical details on the exploit that you will be using on this page, see [here](https://github.com/MrNbaYoh/safecerthax).

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

safecerthax is compatible with all Old 3DS and Old 2DS consoles in all regions on system versions 1.0.0 through 11.14.0.

This exploit will not work on the New 3DS, New 3DS XL, or New 2DS XL. Please ensure that the console you are modding is an Old 3DS, Old 3DS XL, or Old 2DS before continuing.
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### Qué necesitas

* The latest release of [SafeB9SInstaller](https://github.com/d0k3/SafeB9SInstaller/releases/download/v0.0.7/SafeB9SInstaller-20170605-122940.zip) (direct download)
* The latest release of [boot9strap](https://github.com/SciresM/boot9strap/releases/download/1.4/boot9strap-1.4.zip) (direct download)
* The latest release of [Luma3DS](https://github.com/LumaTeam/Luma3DS/releases/latest) (the Luma3DS .zip file)

### Instrucciones

#### Section I - Hardware Button Check

In this section, you will see whether your shoulder buttons are working on your console. This will determine whether your console is compatible with this method.

1. Power on your console
1. Once you see the HOME Menu, press the (Left Shoulder) and (Right Shoulder) buttons at the same time
    + The camera applet should appear
1. Power off your console

If the camera did NOT appear, you cannot follow this method. If this is the case, stay on your current firmware and ask [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for help.
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#### Sección II - Preparativos

In this section, you will copy the files needed to trigger the safecerthax exploit.

1. Inserta tu tarjeta SD en tu computadora
1. Copia los archivos `boot.firm` y `boot.3dsx` desde el `.zip` de Luma3DS a la raíz de tu tarjeta SD
    + La raíz de tu tarjeta SD se refiere al primer directorio de la tarjeta, donde puedes ver la carpeta Nintendo 3DS pero no estás dentro de ella
1. Crea una carpeta llamada `boot9strap` en la raíz de tu tarjeta SD
1. Copia `boot9strap.firm` y `boot9strap.firm.sha` desde el `.zip` de `boot9strap` a la carpeta `/boot9strap/` en tu tarjeta SD
1. Copia `SafeB9SInstaller.bin` desde el `.zip` de SafeB9SInstaller a la raíz de tu tarjeta SD
1. Reinsert your SD card into your console
1. Power on your console

#### Section III - safecerthax proxy

In this section, you will change your Internet connection settings to use a proxy network designed to exploit the System Update feature of your console.

{% include_relative include/addproxy.txt %}
1. Power off your console

#### Section IV - safecerthax

In this section, you will enter Safe Mode (a feature available on all 3DS family consoles) where safecerthax will be triggered, which will launch you into the boot9strap (custom firmware) installer.

1. With your console still powered off, hold the following buttons: (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A), and while holding these buttons together, power on your console
    + Keep holding the buttons until the console boots into Safe Mode (a "system update" menu)
1. Press "OK" to accept the update
    + There is no update. This is part of the exploit
1. Press "I accept" to accept the terms and conditions
1. The update will eventually fail, with the error code `003-1099`. This is intended behaviour
1. Press "OK" to close the error message
1. Si el exploit ha funcionado, habrás iniciado SafeB9SInstaller
    + If the console freezes or crashes, force power off the console, then retry this section

#### Section V - Installing boot9strap

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

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

#### Section VI - Restoring default proxy

{% include_relative include/rmproxy.txt %}

___

### Continúa en [Finalizar instalación](finalizing-setup)
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