1. Try powering the TIU with a wall wart like Marty said, rather than powering through fixed 1.
2. I probably would not have done any downloads, as anything produced recently (and the TIU and WIU in the same package is fairly recent) should be more than capable of running the wi-fi app without any updates. Hopefully, both units are now running the most up to date version.
3. Buy Barry Broskowitz's "DCS WIFI COMPANION 2ND EDITION" - should help immensely with any issues.
4. If you have an engine you can run conventionally, disconnect the wi-fi from the system and just run the TIU conventionally to make sure it is working. Then add the wi-fi unit.
5. Last resort - buy a DCS hand held remote and get the TIU working with the remote and with the wi-fi disconnected and then add the wi-fi unit.
I understand your frustration that it should work "out of the box", but my personal experience is that DCS (like many other things in model railroading) can be finicky and require several sets and re-sets before "clicking".
