watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

228.25 MB

Release Date

2019-08-26T17:16:06Z

Update Type

Normal release

Delta update - requires 5.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm, LTE) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-26T17:16:06Z. The update package is 228.25 MB. This is a delta (partial) update that requires 5.2 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 a43f4d047883ec2f9efd2bc5dd59939c4ad5025b.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92241/1C9D9238-C502-11E9-AECB-9F6850566A18/com_apple_MobileAsset_SoftwareUpdate/a43f4d047883ec2f9efd2bc5dd59939c4ad5025b.zip