watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

831.19 MB

Release Date

2019-08-26T17:14:46Z

Update Type

Normal release

Delta update - requires 4.2 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 2019-08-26T17:14:46Z. The update package is 831.19 MB. This is a delta (partial) update that requires 4.2 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 a108f3a35a2992f66c8d52ef03bb1e47937a760c.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91989/B085A5B8-C501-11E9-A5B3-D8B93EB7D1FF/com_apple_MobileAsset_SoftwareUpdate/a108f3a35a2992f66c8d52ef03bb1e47937a760c.zip