watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

564.15 MB

Release Date

2017-09-12T19:04:48Z

Update Type

Normal release

Delta update - requires 3.1.1 installed first.

Download OTA

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

About This Update

watchOS 4.0 (build 15R372) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2017-09-12T19:04:48Z. The update package is 564.15 MB. This is a delta (partial) update that requires 3.1.1 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 c1d8837ef7ed8d92604016a61b13268f942db64e.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/031-94387-201700919-7EE3273E-8E8E-11E7-8052-F0B7B54D2808/com_apple_MobileAsset_SoftwareUpdate/c1d8837ef7ed8d92604016a61b13268f942db64e.zip