watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5535b

File Size

326.69 MB

Release Date

2018-04-02T17:13:23Z

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 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 2018-04-02T17:13:23Z. The update package is 326.69 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 7ed20cf8b5aa213d5a8e45d07e09844bb53a5552.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-74360-20180402-8B5C104C-32EF-11E8-8896-E48650D38548/com_apple_MobileAsset_SoftwareUpdate/7ed20cf8b5aa213d5a8e45d07e09844bb53a5552.zip