watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5555c

File Size

307.5 MB

Release Date

2018-05-01T17:06:25Z

Update Type

Normal release

Delta update - requires 4.2.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch (38mm) →

About This Update

watchOS 4.3.1 (build 15T5555c) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2018-05-01T17:06:25Z. The update package is 307.5 MB. This is a delta (partial) update that requires 4.2.2 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 5fcfb60c5d239a1c45d9a619b6bb4f11e10c0560.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-81133-20180430-6F27989C-495B-11E8-84B8-DA0CD91E7F63/com_apple_MobileAsset_SoftwareUpdate/5fcfb60c5d239a1c45d9a619b6bb4f11e10c0560.zip