Have you tried factory data resetting your Watch device after the update?
Please try below steps to reset your device and proceed with the Beta software:
Note: Before you reset the device, please send a report to us, as it will help us analyze the issue more in depth. (Phone > Galaxy Wearable app > Contact us > Error Report)
[Steps]
1. Hold down both buttons on watch until you see the watch resets and then shows the Samsung logo with "Rebooting...". 2. Click the Home & Back buttons twice repeatedly while screen is on "Samsung-Rebooting...". 3. From the text menus, click the Home button (will scroll down) until you see "Recovery menu". 4. Long press on the Home button until the menu changes to Recovery screen. 5. Use the back button to scroll down to Factory reset. (Do not click Home Botton, as it will be "Select" option instead of scrolling down from step3) 6. Click the Home button to select Factory reset. 7. Use the back button to select yes > Click the Home button to activate it.
We apologize for the inconvenience and appreciate your contribution to the beta program.
