watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5565a

File Size

102.6 MB

Release Date

2018-05-07T17:23:23Z

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 15T5565a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-05-07T17:23:23Z. The update package is 102.6 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 0bc1031973dc25060bb65c6cfd042a21e1e77488.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-82081-20180507-1717A3C2-4EF6-11E8-98F2-2E29CEB366E9/com_apple_MobileAsset_SoftwareUpdate/0bc1031973dc25060bb65c6cfd042a21e1e77488.zip