Odd. I was certain that there was a firmware patch for WPA support on the DS but I can't find it now. Not really suitable for you however as I think it disabled WEP.
In my googling I ran across many posts expressing a desire for a firmware patch to enable WAP.
As the wireless settings cannot be accessed without a Wi-Fi enabled game inserted, I suspect the functionality/firmware is not based in the game console but in each game cartridge.
If that is true, and I were Nintendo, I'd be leery of creating a situation where there was a demand for replacements.
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