watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5565a

File Size

79.57 MB

Release Date

2018-05-07T17:23:19Z

Update Type

Normal release

Delta update - requires 4.3.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (38mm) →

About This Update

watchOS 4.3.1 (build 15T5565a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-05-07T17:23:19Z. The update package is 79.57 MB. This is a delta (partial) update that requires 4.3.1 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 1cf56f23173857f94920c532384707dd52cf550e.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-82177-20180507-634EBE74-4EF6-11E8-96E2-3138CEB366E9/com_apple_MobileAsset_SoftwareUpdate/1cf56f23173857f94920c532384707dd52cf550e.zip