watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5555c

File Size

361.45 MB

Release Date

2018-05-01T17:06:58Z

Update Type

Normal release

Delta update - requires 4.2.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (38mm, LTE) →

About This Update

watchOS 4.3.1 (build 15T5555c) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-05-01T17:06:58Z. The update package is 361.45 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 4ede9cacaf258b302b58676349c2de9979225b77.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-81125-20180430-5CF29A42-495A-11E8-BFD5-DB06D91E7F63/com_apple_MobileAsset_SoftwareUpdate/4ede9cacaf258b302b58676349c2de9979225b77.zip