watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5535b

File Size

92.86 MB

Release Date

2018-04-02T17:13:21Z

Update Type

Normal release

Delta update - requires 4.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (38mm) →

About This Update

watchOS 4.3.1 (build 15T5535b) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-04-02T17:13:21Z. The update package is 92.86 MB. This is a delta (partial) update that requires 4.3 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 7a8105645b8394bdc4e6641ee4f87b680382cb6e.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-75334-20180402-C81D22DC-32EF-11E8-9BC2-2E9050D38548/com_apple_MobileAsset_SoftwareUpdate/7a8105645b8394bdc4e6641ee4f87b680382cb6e.zip