I updated my Strap and had and have problems.
After updating the strap did not connect anymore. Did a soft reset on my watch. Deleted it from the app. Only thing that helped was taking out the battery from my Strap to reset the strap.
After that my watch found the sensor and the app found the strap finally
But unfortunately it is still not working correctly. Connected via Ant+ to my watch and via Bluetooth to my headwind , i can see it on Zwift it has four green bars in the Zwift app, but does not send any heart rate to the app. Disconnected etc. no change. Very annoying. I definitely have only problems with the new firmware. The strap worked perfect before and now it's awful