How to fix DSI XL troubleshooting
an error has occurred.press and hold the power button to turn the system off.please see the nintendo dsi operations manual for help troubleshooting.
Larger version of the Nintendo DSi, released March 2010 in North America. Most repairs are accomplished with only a screwdriver and prying tools.
The only thing that I know of that you can try is to replace the wifi board. This is sometimes the cause of this problem. If that does not fix it then you would have to replace the memory chip (from what I've heard).
You can try to just remove and re install the WiFi board...sometimes it just gets loose.
Someone else here might be able to tell you which chip would need to be replaced. I've never bothered with learning about it since these aren't worth much anymore.
I hope this helps.