Learn what to do if you see 'Cannot Install Update' when updating Apple Watch or if your Apple Watch says you need more available storage to install a watchOS update. Make sure that your Apple Watch is connecting properly to its charger.
So if you see an alert on your iPhone that says 'Update Apple Watch' and 'Your Apple Watch software is out of date,' you should update to the latest version of watchOS so that your data, including Activity data, continues to sync to your iPhone. Some iOS updates on your iPhone require that you also update watchOS on your Apple Watch.
It's important to keep your Apple devices up to date so that they have the latest bug fixes and security enhancements. Some iPhone updates might require that you update your Apple Watch
When the update completes, your Apple Watch restarts on its own. Leave your Apple Watch on its charger while the update completes, and don't restart your Apple Watch.
