watchOS 4.3

watchOS

Version

4.3

Build ID

15T5209a

File Size

336.8 MB

Release Date

2018-03-12T20:07:28Z

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 (42mm) →

About This Update

watchOS 4.3 (build 15T5209a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-03-12T20:07:28Z. The update package is 336.8 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 39cf744b2d15a9fd316467d86ec3b867c9811a44.zip.

Direct URL

http://appldnld.apple.com/watchos4.3seed/091-72809-20180221-406748FC-23D3-11E8-BAC7-E9815B3DAFD9/com_apple_MobileAsset_SoftwareUpdate/39cf744b2d15a9fd316467d86ec3b867c9811a44.zip