What's the make and model number of the router? Are you using WEP or WPA? And are you able to get to the DSiWare shop on your DSi XL?I can't seem to get my DS Lite nor the new DSi XL I received for x-mas (love my GF BTW ) to connect to my WiFi. I have gone through all the troubleshooting I can think of. Checked my router against the ones that work; it's fine, even tried their suggestions and nothing changed.
It seems to be able to identify to the router but can't access the net beyond that. When testing connections the signal goes green and my router recognizes "Nintendo DS" as a connected device but it always pops up with error code 051300. The Wii never has an issue with this, nor has any other device I use/have used.
Any ideas? I'm desperate!