watchOS 4.0

watchOS

Version

4.0

Build ID

15R5371a

File Size

527.83 MB

Release Date

2017-08-28T16:53:19Z

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 15R5371a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-08-28T16:53:19Z. The update package is 527.83 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 ac55947c2caa0d34dd923f3fc0282c07295a387f.zip.

Direct URL

http://appldnld.apple.com/watchos4.0seeds/091-30813-20170828-2BA3E3D2-8A7F-11E7-93EB-7078AB25A5A9/com_apple_MobileAsset_SoftwareUpdate/ac55947c2caa0d34dd923f3fc0282c07295a387f.zip