The watchOS 5.2.1 update is live and it brings a series of fixes to the Apple Watch as well as ECG and irregular heartbeat rhythm support to more countries. This is the latest update and it builds on the watchOS update from last year without major new features. This is in addition to all the watchOS 5 Apple Watch features. This is a small, but important update. It will take some time to install, but not as long as the watchOS 5 update.
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https://www.gottabemobile.com/heres-how-long-the-watchos-5-update-takes-to-finish/
