watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

983.52 MB

Release Date

2019-08-26T17:14:43Z

Update Type

Normal release

Delta update - requires 3.2.3 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 2019-08-26T17:14:43Z. The update package is 983.52 MB. This is a delta (partial) update that requires 3.2.3 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 cf233b58147637db5d0899379ef131ae9dfeed2e.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91905/50A567AA-C501-11E9-8816-BB128EC5F0D8/com_apple_MobileAsset_SoftwareUpdate/cf233b58147637db5d0899379ef131ae9dfeed2e.zip