I have a Trendnet router and have been connecting by wifi on my ds to this router for the last 2 YEARS! Unbelievable that I am getting this error code on EVERY ds in my house, with 3 different flash cards. I searched for error code 51300 on the net and this site and tried modifying all of my wifi settings (even though these settings have worked for 2 years straight). Changed channel to 1, 6, or 11. Disabled extended range mode (was already set at this). Turned OFF WEP, just to see if that was the problem. I still get the error. What the hell else can I try?