watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5567a

File Size

146.11 MB

Release Date

2018-05-14T17:14:00Z

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 (38mm) →

About This Update

watchOS 4.3.1 (build 15T5567a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-05-14T17:14:00Z. The update package is 146.11 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 76c617a8c6e91a0910f6367586c90e4e17a44946.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-84266-20180514-B4CF921C-5501-11E8-8E42-480739D97EC1/com_apple_MobileAsset_SoftwareUpdate/76c617a8c6e91a0910f6367586c90e4e17a44946.zip