Well, I don't think you should use anything except the TiVo-branded WiFi adapter. FAR, FAR better performance, the only one that does WPA security (WEP is nearly worthless), and certain to be supported. However, the WUSB11 v2.6 *should* work. First thing to check - make sure the cable is FIRMLY seated in both the TiVo and the adapter. Sometimes they seat enough for power to flow (light the LEDs) but not to work.