watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

200.25 MB

Release Date

2019-08-26T17:16:42Z

Update Type

Normal release

Delta update - requires 5.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-08-26T17:16:42Z. The update package is 200.25 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 f03a23c5758639aa8e432dc2831c8de10be40846.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92149/B514D73E-C501-11E9-AA67-29DC51566A18/com_apple_MobileAsset_SoftwareUpdate/f03a23c5758639aa8e432dc2831c8de10be40846.zip