watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

826.56 MB

Release Date

2019-08-26T17:14:50Z

Update Type

Normal release

Delta update - requires 4.3 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 2019-08-26T17:14:50Z. The update package is 826.56 MB. This is a delta (partial) update that requires 4.3 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 fe397432893b679bf01fe2ea698f8092ca84175a.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91971/99CB78CA-C501-11E9-BA30-F7FCFE6B6A83/com_apple_MobileAsset_SoftwareUpdate/fe397432893b679bf01fe2ea698f8092ca84175a.zip