watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

555.73 MB

Release Date

2017-09-12T19:05:12Z

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 (42mm) →

About This Update

watchOS 4.0 (build 15R372) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2017-09-12T19:05:12Z. The update package is 555.73 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 f4e6d1fafb9328d4d825baab1e66b53151f56540.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/091-20482-201700919-EA2AE414-8E8E-11E7-ADB0-79C1B54D2808/com_apple_MobileAsset_SoftwareUpdate/f4e6d1fafb9328d4d825baab1e66b53151f56540.zip