After a few beta compilations, the watchOS 4.1 (build 15R846) is now officially released to all owners of Apple Watches. A few weeks ago Apple had released watchOS 4.0.1, but today's update is obviously much more significant.
The update brings improvements and bug fixes, but also good news for Apple Watches Series 3 owners like streaming tracks from Apple Music or the iCloud Music Library, possibility to listen to Beats 1 radio live and personalized stations by the new Rdio app, and allows the disconnection of Wi-Fi networks through the Control Center (in the case of GPS + models) Cellular).
For all models, you can also now use Siri to find, discover and play music, playlists or albums, synchronize exercise data with various fitness equipment compatible with the framework GymKit, among others.
WatchOS 4.1 fixes a problem that issued Heartbeat notifications even with the feature disabled, fixes a bug that did not remind some users to get up, returns to show the standing time indicator for all users, solves a problem that prevented the Watch trembling on silent alarms, resolves an issue that prevented the first generation Apple Watch from recharging for certain users, correctly shows sunrise / sunset complications to everyone and restores Mandarin as the standard dictation language for the China.
To update, open the Watch app on your iPhone and go to General Software Update. Before proceeding, make sure that your Apple Watch has at least 50% battery remaining and that it is also connected to power.
Update 10/31/2017 s 18:41
For those interested, here is the support article with all the security fixes for watchOS 4.1.