watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5567a

File Size

333.23 MB

Release Date

2018-05-14T17:14:28Z

Update Type

Normal release

Delta update - requires 4.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm) →

About This Update

watchOS 4.3.1 (build 15T5567a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2018-05-14T17:14:28Z. The update package is 333.23 MB. This is a delta (partial) update that requires 4.2 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 bb3ccfb093f71412f900bb1f56daba40fc016b55.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-84389-20180514-DB400842-5505-11E8-AD94-F51F39D97EC1/com_apple_MobileAsset_SoftwareUpdate/bb3ccfb093f71412f900bb1f56daba40fc016b55.zip