1. Before installing the new version, try uninstalling the old version.
2. In Security Settings on your phone, enable "Install from Unknown Source".
3. Make sure the phone is up to date; the watch supports Android version 4.0 or above.
2. In Security Settings on your phone, enable "Install from Unknown Source".
3. Make sure the phone is up to date; the watch supports Android version 4.0 or above.
