If you're experiencing issues with your Nintendo 3DS and want to start fresh, performing a reset to its factory settings can help. Here's how you can reset your 3DS:

1. Backup your data: Before you proceed with the reset, it's important to back up any data you want to keep. This includes saved games, photos, and other personal files.

2. Access System Settings: Turn on your 3DS and go to the Home menu. From there, navigate to System Settings. Once you're in System Settings, scroll to the right and select 'Other Settings.'

3. Format System Memory: In 'Other Settings,' you'll find an option called 'Format System Memory.' Select this option and choose 'Format System Memory' again to confirm. Keep in mind that this will erase all data and settings on the system.

4. Wait for the process to complete: The system will begin the formatting process, which may take some time depending on the amount of data on your 3DS. Once the process is complete, the 3DS will be restored to its factory settings.

5. Set up your 3DS: After the reset is complete, you can go through the initial setup process to configure your 3DS with your preferred settings. This includes setting the date and time, creating a new Mii, and setting up an internet connection.

By following these steps, you can effectively reset your Nintendo 3DS to its factory settings. Keep in mind that performing a factory reset will erase all data on the system, so be sure to back up any important files before proceeding. If you're still experiencing issues after the reset, it may be necessary to contact Nintendo support for further assistance.