watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

215.72 MB

Release Date

2019-08-26T17:17:00Z

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, LTE) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-08-26T17:17:00Z. The update package is 215.72 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 ac3e93a5840f67b4df5af39ae8097e4c69c22fbc.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91861/F0B6CD48-C500-11E9-A280-C1A324C37E21/com_apple_MobileAsset_SoftwareUpdate/ac3e93a5840f67b4df5af39ae8097e4c69c22fbc.zip