watchOS 4.0

watchOS

Version

4.0

Build ID

15R5371a

File Size

529.33 MB

Release Date

2017-08-28T16:53:41Z

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 (38mm) →

About This Update

watchOS 4.0 (build 15R5371a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2017-08-28T16:53:41Z. The update package is 529.33 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 a71c7acef5e7c9c0af18fd8a50e37f9c6647bfd5.zip.

Direct URL

http://appldnld.apple.com/watchos4.0seeds/091-30756-20170828-2B2DB50E-8A7F-11E7-9C3E-5778AB25A5A9/com_apple_MobileAsset_SoftwareUpdate/a71c7acef5e7c9c0af18fd8a50e37f9c6647bfd5.zip