What Does WEP Mean on Nintendo DSi? DSi Doesn't Use WEP—Use WPA2/WPA3

WEP is not used by the Nintendo DSi.

WEP (Wired Equivalent Privacy) is an obsolete, insecure Wi-Fi security standard from 1999.

The DSi (and 3DS) support WPA and WPA2 (AES/TKIP). Modern routers should use WPA2-AES or WPA3.

If your router only offers WEP, update its firmware or replace it—WEP is easily hacked.