During an update, your band will automatically disconnect from Bluetooth, and will reconnect once the update is complete.
How to update my champ 2
1. Connect your watch to the phone using the NoiseFit Sync. Open the NoiseFit Sync, go to settings, select Noise Champ2 and then click on check for update. Follow the onscreen instructions to update your watch.
2. Check the network signal quality of the area where the user is located. The call signal may be poor if the network connection is not stable. Advise the user to try making calls in an open area with stable network connection.
3. If the issue persists, un-pair your watch from the phone, then pair the watch with another phone, and try again. If issue can be well received, it indicates that there is an issue with your phone's Bluetooth. It is recommended that you change another phone. If the issue still persists, this is an issue with your watch's Bluetooth.