@Wayne-TP thanks for your reply. Here are the steps it took to be able to reconfigure the four P110s using the Tapo app on my phone: power up the plug near the house router hold in the power button...

@Wayne-TP thanks. My Tapo app has changed somewhat and my four P110 devices have disappeared. So I can't load beta firmware. What's happened?

Previously my four P110 smart plugs were added to the Tapo app and schedules were running for each of them. Yesterday I wanted to make a change to the schedule of plug 3 but on opening the app...