watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

143.82 MB

Release Date

2019-08-26T17:16:41Z

Update Type

Normal release

Delta update - requires 5.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-08-26T17:16:41Z. The update package is 143.82 MB. This is a delta (partial) update that requires 5.2 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 92a553574a39d8c9f8f7f0a84831fcc7e1764a86.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91960/8A00391C-C501-11E9-88DF-F9322AC1584C/com_apple_MobileAsset_SoftwareUpdate/92a553574a39d8c9f8f7f0a84831fcc7e1764a86.zip