i have a first gen motion sensor which will not pair. i have tried battery off for 10 mins,resetting it etc. i have added this device and got as far as take the tab out on the back of the sensor on the app. i have done this,the sensor has flashed 3 times in blue about 5 times thens goes off. i have just purchased this ssytem from ring and all the other ones are fine. can you help please.
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