watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

831.97 MB

Release Date

2019-08-26T17:15:26Z

Update Type

Normal release

Delta update - requires 4.2.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (42mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-08-26T17:15:26Z. The update package is 831.97 MB. This is a delta (partial) update that requires 4.2.3 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 123574c5c2b8c5e7603344267580afc03d4133b3.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92252/3176A870-C502-11E9-BBF8-C76B50566A18/com_apple_MobileAsset_SoftwareUpdate/123574c5c2b8c5e7603344267580afc03d4133b3.zip