watchOS 4.0

watchOS

Version

4.0

Build ID

15R5372

File Size

88.17 MB

Release Date

2017-09-12T19:05:26Z

Update Type

Normal release

Delta update - requires 4.0 installed first.

Download OTA

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

About This Update

watchOS 4.0 (build 15R5372) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2017-09-12T19:05:26Z. The update package is 88.17 MB. This is a delta (partial) update that requires 4.0 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 1d20caaa286319e779394f527812378f90ec605b.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/091-31062-201700919-8C4420E4-8E8F-11E7-B05C-3CCEB54D2808/com_apple_MobileAsset_SoftwareUpdate/1d20caaa286319e779394f527812378f90ec605b.zip