Here is a screen shot out of the manual. You have to hit re-link button in your app, then push this button in for a couple seconds then release. It should link very quickly.
solentlife Posted at 2017-7-13 04:18
Two small holes next to each other where red arrow indicates .. outside is LED .. inside one is the button .... toothpick of similar to click it.
I just updated and had to click mine an hour back.
Thanks Nigel. I saw the LED but thought both were LED's.