Hi I have the same issue after update non of the activity or HR sensor or Compass or Rise to wake didn’t work.
Following options I have tried.
- Factory Reset multiple times
- Unpair the watch and Pair again.
- Hard Reset the watch
- Theater mode off
- Resync the activity multiple times
Non of the above mentioned did not work.
Then I visited Apple Care service center They diagnosed my Apple Watch said Gyroscope sensor and other sensors not working only option is replace the watch but it’s not under warranty. That is the only option they told to me.
Finally Finally My Apple Watch starts working Final step what I have done
I drained my Apple Watch Battery till my watch switched off automatically due to lack of juice then I waited 24 hr Then I charged my watch till 8 percent then I tested HR rate raise to wake up Activities Bingo all sensors are working as expected. Thanks to this forum this suggestion I got it from this one of the victim posted same thing. It worked.
I am pretty happy to say Apple Watch working as expected.
hope this will help others.