watchOS 4.0

watchOS

Version

4.0

Build ID

15R5365a

File Size

527.55 MB

Release Date

2017-08-22T16:58:29Z

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 15R5365a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-08-22T16:58:29Z. The update package is 527.55 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 e28fd5effb9f48fbbee17d40a84b08defd80dfc6.zip.

Direct URL

http://appldnld.apple.com/watchos4.0seeds/091-29973-20170821-71D03406-84F7-11E7-A0AE-509EAA25A5A9/com_apple_MobileAsset_SoftwareUpdate/e28fd5effb9f48fbbee17d40a84b08defd80dfc6.zip