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

{% include toc title="Table of Contents" %}

### Required Reading

safecerthax is compatible with all Old 3DS and Old 2DS devices in all regions.

If your (Right/Left Shoulder), (D-Pad Up) or (A) buttons do not work, or your ISP is rerouting DNS changes, you will need to use an alternate method, like [Installing boot9strap (Browser)](installing-boot9strap-(browser)).
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This exploit will not work on the New 3DS, New 3DS XL, or New 2DS XL. Please ensure that the device you are modding is an Old 3DS, Old 3DS XL, or Old 2DS before continuing.
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### What You Need

* The latest release of [SafeB9SInstaller](https://github.com/d0k3/SafeB9SInstaller/releases/latest)
* The latest release of [boot9strap](https://github.com/SciresM/boot9strap/releases/latest) *(`boot9strap-1.3.zip`; not the `devkit` file, not the `ntr` file)*
* The latest release of [Luma3DS](https://github.com/LumaTeam/Luma3DS/releases/latest) 

### Instructions

#### Section I - Prep Work
1. Desligue seu dispositivo
1. Insira o cartão SD no seu computador
1. Copy `boot.firm` and `boot.3dsx` from the Luma3DS `.zip` to the root of your SD card
1. Crie uma pasta chamada `boot9strap` na raiz do seu cartão SD
1. Copy `boot9strap.firm` and `boot9strap.firm.sha` from the boot9strap `.zip` to the `boot9strap` folder on your SD card
1. Copy `SafeB9SInstaller.bin` from the SafeB9SInstaller `.zip` to the root of your SD card
1. Reinsira seu cartão SD no seu dispositivo
1. Ligue o seu dispositivo

#### Section II - safecerthax DNS
1. Launch the System Settings application
1. Navigate to `Internet Settings` -> `Connection Settings`
1. Click on your network connection slot and navigate to `Change Settings` -> `Next Page (right arrow)` -> `DNS`
1. Set "Auto-Obtain DNS" to "No", then click `Detailed Setup`
1. Set both the Primary DNS and Secondary DNS to `054.038.133.070`
1. Click OK, then click Save
1. When prompted, click "Test" to perform the connection test
	+ The test should succeed
1. Desligue seu dispositivo

#### Section III - safecerthax
1. With your device still powered off, hold the following buttons: (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A), then press (Power)
  + Keep holding the buttons until the device boots into Safe Mode
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
  + The update should fail and an error message should appear
  + If the update does not fail, it is possible that your ISP is rerouting DNS changes. Try another internet connection, or follow an alternate method, like [Installing boot9strap (Browser)](installing-boot9strap-(browser)).
1. Press "OK" to close the error message
1. Se o exploit tiver sucesso, você terá entrado no SafeB9SInstaller
  + If the console freezes or crashes, force power off the console, then retry this section
 
#### Section IV - Installing boot9strap

1. Espere todos as verificações de segurança finalizarem
1. Quando solicitado, aperte a sequência de botões dada para instalar o boot9strap
1. Quando concluído, aperte (A) para reiniciar o seu dispositivo

#### Section V - Configuring Luma3DS

1. Seu dispositivo deve ter reiniciado no menu de configuração de Luma3DS
  + If you get a black screen, [follow this troubleshooting guide](troubleshooting#black-screen-on-sysnand-boot-after-installing-boot9strap)
1. Use o botão (A) e os botões direcionais para ativar o seguinte:
  + **"Show NAND or user string in System Settings"**
1. Aperte (Start) para salvar e reiniciar
  
#### Section VI - Restoring default DNS
1. Launch the System Settings application
1. Navigate to `Internet Settings` -> `Connection Settings`
1. Click on your network connection slot and navigate to `Change Settings` -> `Next Page (right arrow)` -> `DNS`
1. Set "Auto-Obtain DNS" to "Yes"
1. Click OK, then click Save
1. When prompted, click "Test" to perform the connection test
	+ The test should succeed
1. Desligue seu dispositivo

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### Continue to [Finalizing Setup](finalizing-setup)
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