Installing boot9strap (safecerthax)

如果有疑问并且懂英语的话,可以到 Nintendo Homebrew Discord 服务器上使用英文寻求帮助。(请注意,如果你身处中国大陆,你可能需要通过科学上网来访问 Discord) 你也可以到译者的 QQ 群寻求帮助,群号为 942052497。


For technical details on the exploit that you will be using on this page, see here.


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.



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
  2. Once you see the HOME Menu, press the (Left Shoulder) and (Right Shoulder) buttons at the same time
    • The camera applet should appear
  3. 将主机关机

If the camera did NOT appear, you cannot follow this method. If this is the case, use Installing boot9strap (MSET9) instead.

第二步 – 准备工作

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

  1. 将你的 SD 卡插入到电脑
  2. 解压 Luma3DS .zip 里的 boot.firmboot.3dsx 到你 SD 卡的根目录
    • 根目录指的是你点进 SD 卡看到的目录,你可以在这个目录下看到 Nintendo 3DS 文件夹,但请不要点进去
  3. 在 SD 卡根目录创建一个名为 boot9strap 的文件夹
  4. 从boot9strap .zip 文件中复制 boot9strap.firmboot9strap.firm.sha 到你SD卡的 /boot9strap/ 文件夹中
  5. 从 SafeB9SInstaller .zip 压缩包中复制 SafeB9SInstaller.bin 到 SD 卡根目录下
  6. Reinsert your SD card into your console
  7. 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.



  1. 打开系统设置(本体設定 / System Settings)
  2. 进入到 互联网设置(インターネット設定 / Internet Settings) -> 连接设置(インターネット接続設定 / Connection Settings)
  3. 点击你目前在用的连接点槽位,然后进入到 设置变更(設定変更 / Change Settings) -> 下一页(右箭头) -> 代理设置(Proxy)
  4. 设置“代理服务器 (Proxy)”为“是(する / Yes)”,然后点击详细设置(詳細設定 / Detailed Setup)
  5. 将代理服务器设置为,端口设置为 8080
  6. 点击 OK,然后点击保存(保存する / Save)
  7. 当提示时,点击“测试(テスト / Test)”进行连接测试
    • 测试应该会成功
  8. 点击 “OK” 继续
  9. 将主机关机

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)
  2. Press “OK” to accept the update
    • There is no update. This is part of the exploit
  3. Press “I accept” to accept the terms and conditions
  4. The update will eventually fail, with the error code 003-1099. This is intended behaviour
  5. Press “OK” to close the error message
  6. 如果一切成功的话,你将自动进入 SafeB9SInstaller
    • If the console freezes or crashes, force power off the console, then retry this section

第五步 – 安装 boot9strap

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

  1. When prompted, input the key combo given on the top screen to install boot9strap
  2. Once it is complete, press (A) to reboot your console
  3. 你的主机应该会在开机后进入 Luma3DS 配置菜单
    • Luma3DS 配置菜单用于设置 Luma3DS 自制固件的可选功能 其中有许多功能可用于个性化或调试
    • 对于本手册的目的而言,请不要修改默认设置(不要选中或者取消选中任何东西)
    • 如果你的主机在你尝试开机后直接自动关机了,请确认你已经从 Luma3DS .zip 中复制了 boot.firm 文件到你的 SD 卡根目录中
  4. 按下 “Start” 键保存设置并重启

At this point, your console will boot to Luma3DS by default.

  • 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.
  • On the next page, you will install useful homebrew applications to complete your setup.

Section VI - Restoring default proxy


  1. 打开系统设置(本体設定 / System Settings)
  2. 进入到 互联网设置(インターネット設定 / Internet Settings) -> 连接设置(インターネット接続設定 / Connection Settings)
  3. 点击你目前在用的连接点槽位,然后进入到 设置变更(設定変更 / Change Settings) -> 下一页(右箭头) -> 代理设置(Proxy)
  4. 将 “代理设置(Proxy)”设置为 “否(No/しない)”
  5. 点击 OK,然后点击保存(保存する / Save)
  6. 当提示时,点击“测试(テスト / Test)”进行连接测试
    • 测试应该会成功
  7. 将主机关机