DS Error Code 20103

This error is caused by an issue with the ID of your Nintendo Wireless (Wi-Fi) Connection.

To solve this error :

Ensure compatibility of the game you are playing with the Nintendo Wireless (Wi-Fi) Connection.

Check to see if your wireless internet connection is working properly.

Test access point by accessing the Nintendo Wireless (Wi-Fi) connection setup screen. This can be done by using a Wi-Fi compatible game and selecting an empty connection file.

Check to see if you are using only licensed products with an official Nintendo seal or official Nintendo licensed product.

Check if your wireless routers DHCP settings are correct.

Create a new Nintendo WFC ID.

If you are connecting for a hotspot, ensure the hotspot is able to connect to the internet.