watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

871.85 MB

Release Date

2019-08-26T17:15:51Z

Update Type

Normal release

Delta update - requires 4.3.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (38mm, LTE) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-08-26T17:15:51Z. The update package is 871.85 MB. This is a delta (partial) update that requires 4.3.2 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 b4ab51fdcb63589022d911c7e174908b16d3ab34.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92261/37EE29A8-C502-11E9-A6D9-0F6D50566A18/com_apple_MobileAsset_SoftwareUpdate/b4ab51fdcb63589022d911c7e174908b16d3ab34.zip