watchOS 4.0

watchOS

Version

4.0

Build ID

15R5365a

File Size

513.65 MB

Release Date

2017-08-22T16:58:26Z

Update Type

Normal release

Delta update - requires 3.2.3 installed first.

Download OTA

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

About This Update

watchOS 4.0 (build 15R5365a) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2017-08-22T16:58:26Z. The update package is 513.65 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 9a527ca4e3c3b755d10b20d84ae11f9ad4270967.zip.

Direct URL

http://appldnld.apple.com/watchos4.0seeds/091-29963-20170821-6DC4B36E-84F7-11E7-AA74-519DAA25A5A9/com_apple_MobileAsset_SoftwareUpdate/9a527ca4e3c3b755d10b20d84ae11f9ad4270967.zip