watchOS 4.0

watchOS

Version

4.0

Build ID

15R372

File Size

768.33 MB

Release Date

2017-09-12T19:04:47Z

Update Type

Normal release

Delta update - requires 2.0 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch (38mm) →

About This Update

watchOS 4.0 (build 15R372) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2017-09-12T19:04:47Z. The update package is 768.33 MB. This is a delta (partial) update that requires 2.0 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 1bedf0f0ba8d499865846215cccda78f244f915e.zip.

Direct URL

http://appldnld.apple.com/watchos4.0/031-57870-201700919-05D35468-8E8E-11E7-A816-78B1B54D2808/com_apple_MobileAsset_SoftwareUpdate/1bedf0f0ba8d499865846215cccda78f244f915e.zip