watchOS 4.3

watchOS

Version

4.3

Build ID

15T5209a

File Size

307.4 MB

Release Date

2018-03-12T20:07:01Z

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 (build 15T5209a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-03-12T20:07:01Z. The update package is 307.4 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 f3a256aef5e85fa5ddca462a135c0a59c56e54d2.zip.

Direct URL

http://appldnld.apple.com/watchos4.3seed/091-72864-20180221-D4F30B9C-23D2-11E8-B549-20775B3DAFD9/com_apple_MobileAsset_SoftwareUpdate/f3a256aef5e85fa5ddca462a135c0a59c56e54d2.zip