watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U6600

File Size

107.93 MB

Release Date

2019-08-26T17:16:45Z

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) →

About This Update

watchOS 5.3.1 (build 16U6600) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-08-26T17:16:45Z. The update package is 107.93 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 b3521364d9298b094f5ed809850200b189d062d4.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91963/8CB888F8-C501-11E9-B62B-97415E306A08/com_apple_MobileAsset_SoftwareUpdate/b3521364d9298b094f5ed809850200b189d062d4.zip