watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

847.15 MB

Release Date

2019-08-26T17:16:29Z

Update Type

Normal release

Delta update - requires 4.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2019-08-26T17:16:29Z. The update package is 847.15 MB. This is a delta (partial) update that requires 4.3 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is f25df5ba6b82ff5476a401b968c3cad003f86295.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91965/8F1728D4-C501-11E9-AF03-D0821BB5BB91/com_apple_MobileAsset_SoftwareUpdate/f25df5ba6b82ff5476a401b968c3cad003f86295.zip