- If your device is running *Luma 11.0*, it is *100% safe* to update. You can check your Luma version by holding (Select) while booting your device.
- If your device is on an older Luma version, you should [update Luma](checking-for-cfw) before you update your device to 11.16.0.
- If your device does not yet have custom firmware, you can still install it on this version for free without any additional hardware, but the recommended method has been changed.
**A:** There was a ban wave in May 2017 that banned CFW users from online play (eShop access, NNIDs, and Nintendo Accounts were unaffected), seemingly at random. A ban wave at such a scale has not been seen since. That being said, we don't know what Nintendo may have in store in the future. At this time, we don't think that bans are something that you need to worry about.
**A:** You will need at least 1.5GB of free SD card space to follow this guide in its entirety. 雖然任天堂官方只有列出 3DS 可用的 SD 卡最大容量為 32GB,但是實際上只要能格式化成 FAT32 的記憶卡都可以使用。 目前已知較大的 SD 卡可能會造成 GBA 和自定義主題的相關問題,因此不建議使用大於128GB的SD卡。
**A:** 不會。 Custom firmware can be installed for free on the latest firmware without any hardware devices. In fact, 3DS-mode flashcarts like Gateway and Sky3DS are not recommended because they are obsolete and may carry ban or brick risk.
**A:** Historically, the 3DS used to have userland homebrew access through older exploits like ninjhax. The level of system access granted with userland allowed you to run basic homebrew and emulators but did not allow you to (easily) modify games or dump cartridges. It was also a lot less stable, with homebrew often ungracefully crashing and requiring a full reboot. Custom firmware grants a far greater level of system access while also being more stable than homebrew-only entrypoints.
**A:** If you are using Luma3DS, your custom firmware loader (boot9strap) will *never* be removed when performing a system update. There have been updates in the past that have resulted in Luma3DS crashing on boot, so it is a good idea to wait a couple of hours to ensure that the latest update will not temporarily render the device unusable until Luma3DS is updated. System updates can be performed the same way as they are on a stock 3DS: through System Settings, Safe Mode, or the update prompt when the update is automatically downloaded.
**A:** Copy and paste your SD card contents to a new SD card formatted as FAT32. For 128GB cards, an allocation size of 65536 is recommended. 目前已知較大的 SD 卡可能會造成 GBA 和自定義主題的相關問題,因此不建議使用大於128GB的SD卡。
**A:** Yes, system transfers can be performed through the official System Transfer function to other consoles with CFW (inconsistencies may occur if the target console is stock). Tickets for illegitimate titles (homebrew) will not transfer but can be made to reappear with [faketik](https://github.com/ihaveamac/faketik/releases/latest). Make sure that you do not perform a wireless transfer, as this will delete illegitimate titles. CFW will remain on both consoles.
* **CIA 格式**的自製程式:只需要直接安裝更新版本的 CIA 即可,通常舊的會被直接替換。 如果舊的 CIA 沒有被替換掉你也可直接去資料管理 (Data Management) 中刪除舊版的程式,就像你刪其他程式或遊戲一樣。
**3DSX 格式**的自製程式:替換 `/3ds/` 資料夾內的 3DSX 檔案即可。 If the homebrew application includes additional assets, you may need to place that folder somewhere else. Refer to the documentation of the homebrew application.
**A:** You will need to [dump the updates](dumping-titles-and-game-cartridges) from a 3DS that has the updates installed. The Nintendo eShop only contains updates for the console's region (a Japanese 3DS will only have updates for Japanese games).
**A:** 看看我們的[疑難排解](troubleshooting)頁面。 **Uninstalling CFW when your device is in an unbootable state is not recommended, as it is very likely to lead to a brick**.
**A:** It is recommended that you upgrade your setup to a modern, boot9strap-based one. Follow the [Checking for CFW](checking-for-cfw) guide to see how to upgrade your setup.
**A:** The vast majority of modern homebrew (such as Checkpoint and BootNTR Selector) have only been tested on modern, boot9strap-based setups and may not work entirely (or at all) on older setups based on menuhax, A9LH, or Gateway. In addition, depending on your setup, you may be unable to safely update to the latest firmware. Modern, boot9strap-based setups allow for a greater level of system access than previous hacks, including the ability to dump your console's bootrom.
**A:** Your old setup (including your EmuNAND, if you have one) can usually be directly migrated to boot9strap with no data loss. If you have data that is particularly important to you, it would be a good idea to make a decrypted backup of your save data before upgrading your setup with a tool like [JKSM](https://github.com/J-D-K/JKSM/releases/tag/12%2F20%2F2018).