watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5535b

File Size

130.92 MB

Release Date

2018-04-02T17:13:25Z

Update Type

Normal release

Delta update - requires 4.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (42mm) →

About This Update

watchOS 4.3.1 (build 15T5535b) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-04-02T17:13:25Z. The update package is 130.92 MB. This is a delta (partial) update that requires 4.3 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 08acc5dee267d3b50822ae473677e6fa4f07de4e.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-75320-20180402-BDC61D52-32EF-11E8-B311-218E50D38548/com_apple_MobileAsset_SoftwareUpdate/08acc5dee267d3b50822ae473677e6fa4f07de4e.zip