Apple Watch users can now download watchOS 5.1.2 over the air. It’s a free update and unlocks the ECG app on Series 4 watches in the United States.
Apple Watch users can now download watchOS 5.1.2 over the air. It’s a free update and unlocks the ECG app on Series 4 watches in the United States.
Perhaps the biggest feature which Apple announced with the Apple Watch Series 4 was the inclusion of the ECG sensor. But up till this point, that sensor lay dormant and was dependent on a software update to arrive to unlock all features. watchOS 5.1.2 is that update and those living in the United States can start using their devices to get an ECG reading on the fly. Keep in mind that this feature is only limited to those with Series 4 watches and those residing in the United States only.
Related Download: watchOS 5.0.1 Released – Fixes Activity Ring, Stand Goal, Charging Bugs
If you’re wondering what the full contents of the update are, here’s the complete changelog:
With that out of the way, you can download the latest update for all compatible watches over the air.

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