watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

997.82 MB

Release Date

2019-08-26T17:14:37Z

Update Type

Normal release

Delta update - requires 3.0 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 2019-08-26T17:14:37Z. The update package is 997.82 MB. This is a delta (partial) update that requires 3.0 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 b5b5b35d113efb8639b12036c145a459c3e2261c.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92222/0C15B878-C502-11E9-AD4F-786550566A18/com_apple_MobileAsset_SoftwareUpdate/b5b5b35d113efb8639b12036c145a459c3e2261c.zip