watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5555c

File Size

307.66 MB

Release Date

2018-05-01T17:06:30Z

Update Type

Normal release

Delta update - requires 4.2 installed first.

Download OTA

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

About This Update

watchOS 4.3.1 (build 15T5555c) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-05-01T17:06:30Z. The update package is 307.66 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 d0691312fb67aa05f26613bc49d609a41d312313.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-81237-20180430-EC973EC0-495D-11E8-A66C-211FD91E7F63/com_apple_MobileAsset_SoftwareUpdate/d0691312fb67aa05f26613bc49d609a41d312313.zip