watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

537.95 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 537.95 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 5fec5f6620f7bc82075aa3f2c56860f06f23910a.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/091-17786-201700919-DDB7FA32-8E8E-11E7-8FE3-0ABFB54D2808/com_apple_MobileAsset_SoftwareUpdate/5fec5f6620f7bc82075aa3f2c56860f06f23910a.zip