Setting up HR zones on my Venu 3 does not seem to work at all. Neither from the watch itself nor from Connect.
I am not able to change zone 5. It just sticks to 90 - 100%. For all other zones, I get apparently completely random numbers. E.g. I select 70 and the watch will set it to 31..or some other strange number. Also, it will repeatedly change the lower limit of zone 1 even though I am currently editing zone 3. Often the numbers the watch selects by itself are completely absurd. Like zones that have a higher lower limit that upper limit, e.g. 70 - 31%... . Obviously, the zones are interdependent and shouldn't have gaps between them, but this is not why the watch changes my setting, because the values it selects make no sense at all.
I've tried setting the zones from zone 1 and up - and from zone 5 and down (though I can't change zone 5), but the results are equally frustrating.
For your info, I've been using Garmin watches and bike computers for many years and own a list of devices, so I should like to think that I know how HR zones are set.