watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U6600

File Size

73.82 MB

Release Date

2019-08-26T17:16:46Z

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 2019-08-26T17:16:46Z. The update package is 73.82 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 c5a2238d795cffb34e45d85851231a2f560a5a40.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-92253/3217FE3C-C502-11E9-A4BD-D96B50566A18/com_apple_MobileAsset_SoftwareUpdate/c5a2238d795cffb34e45d85851231a2f560a5a40.zip