watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

539.04 MB

Release Date

2017-09-12T19:05:11Z

Update Type

Normal release

Delta update - requires 3.2.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (38mm) →

About This Update

watchOS 4.0 (build 15R372) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2017-09-12T19:05:11Z. The update package is 539.04 MB. This is a delta (partial) update that requires 3.2.3 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 5fb1a9932fb963eeead7d7ed2e70cb7587c3b676.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/091-17790-201700919-DFF847E8-8E8E-11E7-B32F-89BFB54D2808/com_apple_MobileAsset_SoftwareUpdate/5fb1a9932fb963eeead7d7ed2e70cb7587c3b676.zip