watchOS 4.0

watchOS

Version

4.0

Build ID

15R5371a

File Size

541.76 MB

Release Date

2017-08-28T16:53:48Z

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 15R5371a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2017-08-28T16:53:48Z. The update package is 541.76 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 ed37eb9f031e91a5315c8ec98d711ef447d2e2cb.zip.

Direct URL

http://appldnld.apple.com/watchos4.0seeds/091-30755-20170828-F3DD5992-8A7E-11E7-9D5A-5074AB25A5A9/com_apple_MobileAsset_SoftwareUpdate/ed37eb9f031e91a5315c8ec98d711ef447d2e2cb.zip