watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

537.56 MB

Release Date

2017-09-12T19:04:49Z

Update Type

Normal release

Delta update - requires 3.2.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch (42mm) →

About This Update

watchOS 4.0 (build 15R372) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-09-12T19:04:49Z. The update package is 537.56 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 b7f5c8f429c4ab2f0e067ef122ab959045fdc7ac.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/091-25962-201700919-F38CE246-8E8E-11E7-B3D8-2FC2B54D2808/com_apple_MobileAsset_SoftwareUpdate/b7f5c8f429c4ab2f0e067ef122ab959045fdc7ac.zip