Update to Apple Watch operating system comes along with the release of iOS 11.
watchOS 4 features an updated Heart Rate app, giving even more insight to heart rate, including measurements during resting, workout, recovery, walking and Breathe sessions. Customers can also choose to receive a notification when their heart rate is elevated above a specific threshold while inactive. Other great watchOS 4 features include the proactive Siri watch face that displays the information users need most throughout the day, an enhanced Workout app with new interface, custom High-Intensity Interval Training (HIIT) workout type and auto-sets for pool swims. With GymKit, users will soon enjoy the ability to connect to their favorite cardio equipment and experience two-way synchronization of data with just a tap, resulting in the most accurate information possible.
To update to watchOS 4, go to the Watch app on your iPhone. Go to General in the My Watch menu. Then tap on Software Update. Your phone will search for your watch’s current version and determine if an update is available. NOTE: Your iPhone must be updated to iOS 11 before the watchOS 4 update will appear in your Watch app. You must first make sure that your watch is connected to WiFi and charged with at least 50% of its battery. Do not restart Apple Watch or remove it from its charger until the update completes.
For more information, visit apple.com/watchOS.