The update may have caused your previous Bluetooth authentication credentials to stop working. You will need to re-sync the Bluetooth connection from the SmartLink to your smartphone.
Go into your smartphone’s Bluetooth settings and choose to forget the SmartLink.
iOS: Next to the SmartLink listing, press the information circle and then choose to forget the SmartLink.
Android: Press the SmartLink listing and then choose to forget the SmartLink.
Once done, configure your ProSmart app to work with the SmartLink again.