watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5545b

File Size

326.84 MB

Release Date

2018-04-16T17:04:12Z

Update Type

Normal release

Delta update - requires 4.2 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 15T5545b) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-04-16T17:04:12Z. The update package is 326.84 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 8ffdabc06133c9781b01eb85dddc3a464b9acbb3.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-77082-20180416-9C56B3D4-3E70-11E8-84C5-5E28525157AE/com_apple_MobileAsset_SoftwareUpdate/8ffdabc06133c9781b01eb85dddc3a464b9acbb3.zip