Have they ever worked? There is a common problem when the battery runs low, that even when you put a new battery in it stays dormant. Quick fix is to put the battery in backwards for a couple of seconds, then put it in properly. Should sort it.
I tried that battery trick but didn’t help. It will pair but then says my heart rate is like 90 or 70 or some other bullshit number. Occasionally it gives a sensible reading, but then it’ll just drop out or go back to a wrong number
Thanks, I've two garmin ones and neither work. Tried batteries and straps.