The following article will explain what to do if your sync or update fails on V3, G3 or V2.
If your sync or update is unsuccessful and you receive an error message could you please try the following steps below to resolve the issue:
1) Disconnect the watch
2) Hard re-set the watch (hold the top left button down for 15-20 seconds until screen goes blank)
3) Manually log out the app (closing the app doesn't log you out)
4) Close the app
5) Open the app
6) Type email address and password to login
7) Switch watch on
8) Connect watch
9) Re-try the sync
Its also important to make sure the WIFI connection is strong, the watch and the device are near to each other and that the device isn't interrupted during the process (best to keep it on the Shot Scope app until sync is complete).