We have been notified that some users are experiencing a problem where the app freezes - it's been caused by a recent Apple update and our engineers are working on it.
Please don't worry about updating the software on the scale at this time. The update was for usability - reducing calibration time from 5 seconds to 3 seconds, and does not affect the accuracy of the balance score. You can also calibrate the scale manually by pressing with your foot: https://www.zibrio.com/calibrate