watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U6600

File Size

78.61 MB

Release Date

2019-08-26T17:17:08Z

Update Type

Normal release

Delta update - requires 5.3 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 16U6600) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-08-26T17:17:08Z. The update package is 78.61 MB. This is a delta (partial) update that requires 5.3 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 e9f22a8aff7955097ee401ead35b812ac79415d6.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92056/FFE2F70A-C501-11E9-8028-BDB7FE1D56DF/com_apple_MobileAsset_SoftwareUpdate/e9f22a8aff7955097ee401ead35b812ac79415d6.zip