DS Error Code 50003

This error is caused by an connection issue with the Nintendo Wi-Fi USB Connector.

To solve this error :

Move the Nintendo DS within 30 feet of your wireless access point.

Ensure there is no interfering devices by shutting off microwaves, cordless phones, wireless keyboards, and wireless mice.

Face towards the wireless access point with as little interference from your body or objects as possible.

If you are using a router, try disabling the firewall as it may be interfering with the Nintendo Wi-Fi USB Connector.

It may be possible that your home network is incompatible with the Nintendo Wi-Fi USB Connector.

Reinstall software and try again.