I found a second remote and updated the new TIU to ID 4 using Barry's "second way" above. Also updating all TIU's to DCS 6.0 before wifi install. All four TIU's are Rev L. I have one serial interface TIU which I tried to update to 6.0 but my old VISTA laptop which I keep around for its serial interface just couldn't do it. Getting a USB - Serial adapter tomorrow to finish the task.
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