This page offers troubleshooting advice for commonly encountered issues. If you are unable to solve your issue with the advice on this page, please join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and describe your issue, including what you have already tried.
You are missing `boot9strap.firm` and `boot9strap.firm.sha` from the `boot9strap` folder, or the `boot9strap` folder is misnamed. Download the latest release of [boot9strap](https://github.com/SciresM/boot9strap/releases/download/1.3/boot9strap-1.3.zip), and place `boot9strap.firm` and `boot9strap.firm.sha` in the `boot9strap` folder.
There is an issue with your `boot9strap.firm` and `boot9strap.firm.sha` files. Re-download the latest release of [boot9strap](https://github.com/SciresM/boot9strap/releases/download/1.3/boot9strap-1.3.zip), and place `boot9strap.firm` and `boot9strap.firm.sha` in the `boot9strap` folder.
You are missing `secret_sector.bin` from the `boot9strap` folder, or the `boot9strap` folder is misnamed. Download [secret_sector.bin](magnet:?xt=urn:btih:15a3c97acf17d67af98ae8657cc66820cc58f655&dn=secret_sector.bin&tr=udp%3a%2f%2ftracker.torrent.eu.org%3a451%2fannounce&tr=udp%3a%2f%2ftracker.lelux.fi%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.loadbt.com%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.moeking.me%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.monitorit4.me%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.ololosh.space%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.pomf.se%3a80%2fannounce&tr=udp%3a%2f%2ftracker.srv00.com%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.theoks.net%3a6969%2fannounce&tr=udp%3a%2f%2ftracker.tiny-vps.com%3a6969%2fannounce&tr=udp%3a%2f%2fopen.tracker.cl%3a1337%2fannounce&tr=udp%3a%2f%2ftracker.zerobytes.xyz%3a1337%2fannounce&tr=udp%3a%2f%2ftracker1.bt.moack.co.kr%3a80%2fannounce&tr=udp%3a%2f%2fvibe.sleepyinternetfun.xyz%3a1738%2fannounce&tr=udp%3a%2f%2fwww.torrent.eu.org%3a451%2fannounce&tr=udp%3a%2f%2ftracker.openbittorrent.com%3a6969%2fannounce&tr=udp%3a%2f%2f9.rarbg.com%3a2810%2fannounce&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce&tr=udp%3a%2f%2fexodus.desync.com%3a6969%2fannounce&tr=http%3a%2f%2fopenbittorrent.com%3a80%2fannounce) using a torrent client, and place it in the `boot9strap` folder.
This occurs when you use your SD card in multiple 3DS devices and is intended to prevent inadvertently merging data that would not be valid on other devices. To figure out which long folder name is correct for your 3DS, follow these instructions:
Your friend code was blocked from using the friend code bot because your 3DS did not successfully friend the bot. Ensure your 3DS is properly connected to the Internet, then join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask to be unlocked.
The website has determined that your `movable.sed` cannot be brute-forced. Ensure that you gave the correct ID0 to the website. If your ID0 is correct, then you will be unable to use Seedminer and you will have to use an alternate method that will require additional games or hardware.
There is an issue with your `otherapp.bin` file. Download the latest release of [universal-otherapp](https://github.com/TuxSH/universal-otherapp/releases/latest) and place it on the root of your SD card. Do not add the `.bin` extension if you do not already see it.
Your `00000001.sav` and/or `otherapp.bin` files may be misplaced. Ensure that `00000001.sav` is in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `title` -> `00040000` -> `0017c100` -> `data` and that `otherapp.bin` is on the root of your SD card.
If your files are in the correct locations, re-create the save using the [PicHaxx Save Tool](https://3ds.nhnarwhal.com/3dstools/pichaxx.php), then place it in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `title` -> `00040000` -> `0017c100` -> `data`. Ensure that the file is named exactly `00000001.sav` and that you used your console's `movable.sed` to create it. Re-download the latest release of [universal-otherapp](https://github.com/TuxSH/universal-otherapp/releases/latest) and place it on the root of your SD card. Do not add the `.bin` extension if you do not already see it.
Your modified `00000001.sav` file may be misplaced, or you may have used the wrong `movable.sed` when creating it. Re-create the save using the [PicHaxx Save Tool](https://3ds.nhnarwhal.com/3dstools/pichaxx.php), then place it in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `title` -> `00040000` -> `0017c100` -> `data`.
The file `SafeB9SInstaller.bin` is missing or misplaced. Download the latest release of [SafeB9SInstaller](https://github.com/d0k3/SafeB9SInstaller/releases/tag/v0.0.7) and place it on the root of your SD card. Do not add the `.bin` extension if you do not already see it.
There may be an issue with your `otherapp.bin` file. Download the latest release of [universal-otherapp](https://github.com/TuxSH/universal-otherapp/releases/latest) and place it on the root of your SD card. Do not add the `.bin` extension if you do not already see it.
You will need to follow an alternate method, like [Installing boot9strap (USM)](installing-boot9strap-(usm)).
### Failed to mount the SD card!
Back up your data and reformat your SD card as FAT32 with the recommended tool depending on your operating system ([Windows](formatting-sd-(windows)), [macOS](formatting-sd-(mac)), [Linux](formatting-sd-(linux))). MiniTool and the HP formatting tool are known to cause issues with 3DS SD cards.
If this is unsuccessful, try using another SD card.
If your device is on system version 9.4.0, 9.5.0, or 9.6.0, you may be encountering a bug with universal-otherapp. Follow [Homebrew Launcher (Soundhax)](homebrew-launcher-(soundhax)) instead.
If your device is not on those firmwares, it likely indicates that you already have custom firmware. You should [check for CFW](checking-for-cfw).
There is an issue with your `otherapp.bin` file (it is missing, misplaced, or corrupted). Download the latest release of [universal-otherapp](https://github.com/TuxSH/universal-otherapp/releases/latest) and place it on the root of your SD card.
You have the wrong Soundhax file for your device and region, or your device is incompatible with Soundhax. In the latter case, you should update your device to the latest version and follow [Seedminer](seedminer).
The file `SafeB9SInstaller.bin` is missing or misplaced. Download the latest release of [SafeB9SInstaller](https://github.com/d0k3/SafeB9SInstaller/releases/tag/v0.0.7) and place it on the root of your SD card. Do not add the `.bin` extension if you do not already see it.
There may be an issue with your `otherapp.bin` file. Re-download the latest release of [universal-otherapp](https://github.com/TuxSH/universal-otherapp/releases/latest) and place it on the root of your SD card.
If you have a Taiwanese or Mainland Chinese unit (with a T or C in the version string, ie. 11.3.0-##T), join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for assistance.
Back up your data and reformat your SD card as FAT32 with the recommended tool depending on your operating system ([Windows](formatting-sd-(windows)), [macOS](formatting-sd-(mac)), [Linux](formatting-sd-(linux))). MiniTool and the HP formatting tool are known to cause issues with 3DS SD cards.
If this is unsuccessful, try using another SD card.
Ensure that `F00D43D5.bin` is the only file in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `Nintendo DSiWare`. If it is, then re-create it with the [unSAFE_MODE Exploit Injector](https://3ds.nhnarwhal.com/3dstools/unsafemode.php). If this fails, then custom firmware may have been uninstalled on this device in a way that makes this method impossible to perform. If this is the case, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for assistance.
`F00D43D5.bin` is missing from `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `Nintendo DSiWare`. Make sure that `Nintendo DSiWare` is correctly spelled and spaced. Uppercase/lowercase does not matter.
There may be an issue with your `F00D43D5.bin` file (it may be corrupted or intended for the wrong 3DS). Re-create your `F00D43D5.bin` file with the [BannerBomb3 tool](https://3ds.nhnarwhal.com/3dstools/bannerbomb3.php), ensuring that you use the `movable.sed` file for your console.
Ensure that `F00D43D5.bin` is the only file in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `Nintendo DSiWare`. If it is, then re-create it with the [BannerBomb3 tool](https://3ds.nhnarwhal.com/3dstools/bannerbomb3.php). If this fails, then custom firmware may have been uninstalled on this device in a way that makes this method impossible to perform. If this is the case, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for assistance.
There is an issue with your `42383821.bin` file (it is incorrect, missing, misplaced, or corrupted). Re-create your files with the [Fredtool](https://3ds.nhnarwhal.com/3dstools/fredtool.php) website and ensure that you place the `42383821.bin` file from `output.zip` -> `hax` in `Nintendo 3DS` -> `<ID0>` -> `<ID1>` -> `Nintendo DSiWare`.
Your DS Connection Settings application is broken, and you will need Homebrew Launcher access to fix this issue. Join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for assistance.
You may have accidentally touched the touch screen while in the modified Flipnote. Re-enter DS Connection Settings and try again, ensuring that you don't accidentally use the touchscreen.
The file `boot.nds` is missing or misplaced. Download the latest release of [b9stool](https://github.com/zoogie/b9sTool/releases/latest) and place `boot.nds` on the root of your SD card, replacing the existing one.
There is an issue with your `boot.nds` file. Re-download the latest release of [b9stool](https://github.com/zoogie/b9sTool/releases/latest) and place `boot.nds` on the root of your SD card, replacing the existing one.
It is possible that boot9strap was not successfully installed. Follow section B of [this page](https://github.com/zoogie/b9sTool/blob/master/TROUBLESHOOTING.md).
1. Update from Safe Mode by turning off the console, holding (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A) on boot, and following the on-screen prompts
1. Delete your WiFi connection, then reconnect to your WiFi again
1. Reboot your WiFi router
1. Connect to a different WiFi connection, like a mobile hotspot
1. Nintendo servers may be down; Try again later
1. If you still get an error, [follow CTRTransfer](ctrtransfer), then try again
Download this [alternate config.bin](https://cdn.discordapp.com/attachments/196635695958196224/733384123003175074/config.bin) and place it in `/luma/`. This will change the Rosalina key combination to (Y) + (B).
There is an issue with your `boot.3dsx` file (it is missing, misplaced, or corrupted). Download the latest release of [the Homebrew Launcher](https://github.com/fincs/new-hbmenu/releases/latest) and place `boot.3dsx` on the root of your SD card, replacing any existing file. Make sure you are extracting the ZIP file with any tool other than WinRAR, as it is known to cause issues with 3DS-related files.
You did not copy the `gm9` folder from the GodMode9 `.zip` to the root of your SD card. Download the latest release of [GodMode9](https://github.com/d0k3/GodMode9/releases/latest) and place the `gm9` folder on the root of your SD card, merging it with the existing one.
The steps detailed here generally assume that your device has a modern custom firmware setup (boot9strap + Luma3DS 8.0 or greater). If your console is running an older homebrew setup (for example, something based on arm9loaderhax or menuhax), you should update your setup before trying these instructions.
There is an issue with your `boot.firm` file (it is missing, misplaced, or corrupted). Download the [latest release of Luma3DS](https://github.com/LumaTeam/Luma3DS/releases/latest) and place `boot.firm` on the root of your SD card, replacing any existing file. Make sure you are extracting the ZIP file with any tool other than WinRAR, as it is known to cause issues with 3DS-related files.
If you hear a "popping sound", potentially accompanied with the backlight turning on for a split second, there is a hardware issue with your device (such as a disconnected backlight cable). You may be able to get your device to boot by holding it at certain angles.
The steps below can be attempted in any order, but are listed from least to most time-consuming.
1. Power off your device, eject the game cartridge if inserted, power on your device, then wait up to ten minutes. If your device boots within ten minutes, the issue has been fixed and is unlikely to reoccur
1. Rename the `Nintendo 3DS` folder on your SD card to `Nintendo 3DS_BACKUP`, then attempt to boot. If your device successfully boots, there is some issue within your `Nintendo 3DS` folder. Try clearing HOME Menu extdata:
+ If your device now boots to the "An exception occurred" screen, follow [My device boots to an error screen](troubleshooting#my-device-boots-to-an-error-screen)
Your Luma3DS version is outdated. Download the latest release of [Luma3DS](https://github.com/LumaTeam/Luma3DS/releases/latest) and place `boot.firm` on the root of your SD card, replacing any existing file. Make sure you are extracting the ZIP file with any tool other than WinRAR, as it is known to cause issues with 3DS-related files.
Your device is likely hard-bricked. You will need to buy an ntrboot flashcart to reinstall boot9strap in order to attempt to fix your device. This may also indicate a hardware issue that cannot be fixed. In any case, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) for assistance.
+ It is also possible that someone has set a boot-time splash screen that just looks like a brick. Try leaving your device powered on, waiting on the blue screen, for five minutes.
Your device is running Luma3DS/AuReiNand 6.6 or older, likely via arm9loaderhax. You should follow [A9LH to B9S](a9lh-to-b9s) to update your device to a modern custom firmware environment.
