watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5535b

File Size

338.49 MB

Release Date

2018-04-02T17:13:16Z

Update Type

Normal release

Delta update - requires 4.1 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 15T5535b) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-04-02T17:13:16Z. The update package is 338.49 MB. This is a delta (partial) update that requires 4.1 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 cd17d7689a32f6af1fa6514aed3e48d4e5158047.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-74394-20180402-8D06169A-32EF-11E8-BFBD-4A8750D38548/com_apple_MobileAsset_SoftwareUpdate/cd17d7689a32f6af1fa6514aed3e48d4e5158047.zip