watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

491.68 MB

Release Date

2019-08-26T17:16:40Z

Update Type

Normal release

Delta update - requires 5.0 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 2019-08-26T17:16:40Z. The update package is 491.68 MB. This is a delta (partial) update that requires 5.0 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 444c3e89ed1c96a5e04001c6470490f18f95a9f8.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91878/1F70B2A2-C501-11E9-84A3-ECB1CBDDC546/com_apple_MobileAsset_SoftwareUpdate/444c3e89ed1c96a5e04001c6470490f18f95a9f8.zip