Nintendo has just released brand new firmware update 5.1.0-11U for 3DS. You can download the update now via settings app on 3DS.
3DS firmware update 5.1.0-U11 fixes the following issues:
- Resolves an issue that may prevent access to the System Settings or other features.
- Some users received an error during the system update and were then unable to access the System Settings, Nintendo eShop, or Game Notes. This update prevents this from occurring again. If you are currently experiencing this error, please click here for related troubleshooting.