The watchOS 5.1.2 update brings a massive new feature to the Apple Watch with ECG support and a collection of other fixes. With any watchOS update there are good reasons to upgrade right away, but there are also some reasons not to upgrade on day one.
In November after watchOS 5.1 broke some Apple Watch models and Apple was forced to push out watchOS 5.1.1, which is why the Apple Watch updates look slightly ahead of the iPhone and iPad, which are on iOS 12.1.1.
The biggest new feature in watchOS 5.1.2 is the ECG mode for the Apple Watch 4. This update is coming to all models on watchOS 5, but this feature is exclusive to the Apple Watch 4. There is an irregular heartbeat detection feature coming to the Apple Watch Series 1 and up.
Unlike the iOS 12.1.1 update, you cannot go back to watchOS 4 or watchOS 5 if you don’t like this update. Apple’s watchOS 5.1.2 update is coming out today, likely around 10 AM Pacific, 1 PM Eastern.
It will take a while for you to install the watchOS 5 .1.2 update to your Apple Watch. You need to install the iOS 12.1.2 update before you install this, so you’ll want to read this post about the reasons to install iOS 12.1.1, and the reasons not to before you make that jump.
Most of the reasons to install watchOS 5 and watchOS 5.1.2 are about the exciting new Apple Watch features that add to the long list of things the Apple Watch can do. There are also performance improvements and other upgrades. Keep in mind that you may run into watchOS 5 problems and you will need to wait for another update since there is no downgrade option.
There are loads of reasons to install watchOS 5 or watchOS 5.1.1 on your watch today, but there are also several very important reasons not to install this update yet.
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