Apologies for the delay. Please see the post located here for detailed instructions about our new public beta.
Just so I’m not missing anything here. A new software beta is released, which inter alia fixes the issue with CD not being sent to a 920xt and other units. However, unless you have a unit such as an Edge 820 (which records CD using the current software), you may not install the new software.
Maybe we should reword the instructions. Only those listed head units have the inherent ability for you to upload sensor firmware, and then to transfer that firmware to the Vector 3 pedals. As kranderson noted, you can use anyone's newer device to perform the update process, and then you will be able to use your watch or head unit as you had been beforehand.