watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

997.81 MB

Release Date

2019-08-26T17:14:39Z

Update Type

Normal release

Delta update - requires 3.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (38mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-08-26T17:14:39Z. The update package is 997.81 MB. This is a delta (partial) update that requires 3.1 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 c12a3dc052748e9629793b41454cf22f020d54c8.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91935/723C1490-C501-11E9-B3AF-EC0C7DD15EEE/com_apple_MobileAsset_SoftwareUpdate/c12a3dc052748e9629793b41454cf22f020d54c8.zip