This is never the solution to fix any issues you may be encountering with your CFW installation. A better idea would be to ask (in English) for help at [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp).
Any unsigned (illegitimate) games will be rendered unusable and should be manually removed before starting this process by using the Data Management section of the System Settings. Use a [save manager](https://github.com/FlagBrew/Checkpoint/releases/latest) to backup any saves for these unsigned (illegitimate) games you care about.
If you have modified critical system software (such as editing the home menu, unbanning your console, etc), uninstalling CFW WILL BRICK your device! Ensure that you follow all sections of this page.
The purpose of this section is to check whether built-in DS mode applications will continue to work once CFW is uninstalled. If you skip this section, DS mode or its functions may be inaccessible until CFW is reinstalled.
##### DS Connection Settings Test
1. デバイスの電源を入れます
1. Launch the System Settings Application
1. Navigate to `Internet Settings` -> `Nintendo DS Connection Settings`, then click OK
1. You should boot into the Nintendo DS Connection Setup menu
+ If your console displays the Japanese version of Flipnote Studio, a black screen, or an error message, the test has failed
+ If your console displays the Japanese version of Flipnote Studio, a black screen, or an error message, the test has failed
1. 本体の電源を切ります。
If either of these tests has failed, DS mode, DS Download Play, and/or DS Connection Settings may be inaccessible once CFW is uninstalled! You should [fix DS mode](troubleshooting#dsi--ds-functionality-is-broken-after-completing-the-guide) before continuing.
{: .notice--warning}
#### Section III - Safety Test
The purpose of this section is to verify that the console will boot and that critical system functions, like System Settings and the keyboard, will work once CFW is uninstalled. **If you skip this section, you may BRICK your device!**
1. Press and hold (Start), and while holding (Start), power on your device. This will launch GodMode9
+ Note that, if you had to fix the RTC date and time, you will have to fix the time in the System Settings as well after following this guide
1. (Home) ボタンを押してアクションメニューを呼び出します
1. "Scripts..."を選択します
1. Select "safety_test"
1. Read the text on-screen and press (A) to continue
1. You should boot into the regular 3DS Home Menu (any custom theme is irrelevant). If you do, continue these instructions
+ If you do not boot into the regular 3DS home menu (black screen, error screen, etc.), uninstalling CFW **WILL BRICK YOUR DEVICE!**
1. Launch the System Settings Application
+ If the console crashes at this point, the test has failed
1. Select "Other Settings"
1. Select "Profile"
1. Select "User Name"
1. If you are able to enter a new user name, the test was successful
+ If the keyboard does not appear, the screen freezes, or the console crashes, the test has failed
1. 本体の電源を切ります。
If you do NOT boot into the regular 3DS Home Menu, or System Settings / your keyboard is inaccessible, **DO NOT continue with these instructions**! Join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask (in English) for someone there to assist you.
{: .notice--danger}
#### Section IV - NAND Backup
1. Press and hold (Start), and while holding (Start), power on your device. This will launch GodMode9
1. (Home) ボタンを押してアクションメニューを呼び出します
1. "Scripts..."を選択します
1. "GM9Megascript"を選択します
1. "Backup Options"を選択します
1. "SysNAND Backup"を選択します
1. (A) を押して確認します
+ この作業には少し時間がかかります
+ If you get an error, ensure you have at least 1.3GB of free space on your SD card
1. Bキーを押してメインメニューに戻ります
1. Select “Exit”
1. (Home) ボタンを押してアクションメニューを呼び出します
1. Select “Poweroff system” to power off your device
#### Section V - Removing illegitimate content
This section will remove illegitimate content, like homebrew and dumped cartridges. If you have save data that you care about, back it up with a save manager before continuing!
+ This includes common system software such as FBI, Anemone3DS, Luma Updater, Homebrew Launcher, Checkpoint, and others, along with any games and titles that you did *not* install from the eShop
+ Failure to remove all CFW software from both the 3DS and DSiWare sections before uninstalling CFW may prevent or disable access to the Data Management menu after uninstalling CFW
1. (Lボタン) + (十字キー下) + (Select) を同時に押してRosalina menu を開きます
1. "Miscellaneous options"を選びます。
1. "Switch the hb. title to the current app."を選びます。
1. (B) ボタンで続行します
1. (B) を押してRosalinaメインメニューに戻ります
1. (B) を押してRosalinaメインメニューを終了します。
1. Homeボタンを押しダウンロードプレイを閉じます。
1. 再度ダウンロードプレイアプリを開きます。
1. デバイスでHomebrew Launcherが起動されます
1. Launch DSiWare Uninstaller from the list of homebrew
1. Follow the prompts and allow the program to uninstall
1. Once the process has succeeded, exit the Homebrew Launcher and power off your device
#### Section VI - System Format
This section will ensure that all illegitimate tickets are removed, allowing eShop to work normally. This will remove all content from the 3DS and log you out of your NNID. Keep in mind that your console's encryption key will be shuffled, meaning that any old data will be rendered inaccessible, even if you have a backup of your SD contents.
1. デバイスの電源を入れます
1. Open the System Settings application
1. Navigate to Other Settings -> Next Page (until the final page) -> Format System Memory
This is your final opportunity to verify that all safety steps above have been followed! Please ensure that you have followed all sections on this page, **especially** `Section III - Safety Test`, before continuing.
