watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

143.88 MB

Release Date

2019-08-26T17:16:49Z

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 (44mm) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-26T17:16:49Z. The update package is 143.88 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 37338225f2b70a24ea2d9a60e5c02795c12984fe.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92035/E76DFCBA-C501-11E9-BF33-B2BD5E326DEA/com_apple_MobileAsset_SoftwareUpdate/37338225f2b70a24ea2d9a60e5c02795c12984fe.zip