The watchOS 5.3.1 update brings bug fixes and security fixes to the Apple Watch. With any watchOS update, there are good reasons to upgrade right away, but there are also some reasons not to upgrade on day one.
ECG mode for the Apple Watch 4 was a major feature in a previous update, but it didn’t roll out in every country. Previous watchOS updates rolled this out to other countries, and it’s still a good reason to install if you skipped, but this one is more about keeping your watch secure. This update is coming to all models on watchOS 5,
Unlike the iOS 12.4.1 update, you cannot go back to watchOS 4 or watchOS 5 if you don’t like this update. Apple’s watchOS 5.3.1 is available for all users to download after installing iOS 12.4.1.
It will take a while for you to install the watchOS 5.3.1 update to your Apple Watch, but not as long as the main watchOS 5 update. You need to install the iOS 12.4.1 update before you install this, so you’ll want to read this post about the reasons to install iOS 12.4.1, and the reasons not to before you make that jump.
Most of the reasons to install watchOS 5 and watchOS 5.3.1 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 5.3.1 on your watch today, but there are also several very important reasons not to install this update yet.
Install for Security Upgrades
Every time Apple delivers a watchOS update they include a ton of security fixes and upgrades that help keep your data safe and secure.
The watchOS 5.3.1 update is all about security fixes. Apple is not specifically mentioning the fixes for this update, but it did arrive alongside very important iOS security fixes, so they may be related.
Previous security updates included a multitude of fixes for everything from Safari cookies to emojis and fixes to stop malicious content from affecting your watch or phone.
Visit this page for a full list of the Apple security updates for the Apple Watch and other devices.
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