watchOS 4.3.1

watchOS

Version

4.3.1

Build ID

15T5555c

File Size

325.66 MB

Release Date

2018-05-01T17:06:52Z

Update Type

Normal release

Delta update - requires 4.2.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (42mm) →

About This Update

watchOS 4.3.1 (build 15T5555c) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-05-01T17:06:52Z. The update package is 325.66 MB. This is a delta (partial) update that requires 4.2.3 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 c7ea4463f28a9e28bf5a5db44368ed4dfefa8d25.zip.

Direct URL

http://updates-http.cdn-apple.com/2018/watchosseed/091-81271-20180430-4FFFAB90-495F-11E8-89D4-122BD91E7F63/com_apple_MobileAsset_SoftwareUpdate/c7ea4463f28a9e28bf5a5db44368ed4dfefa8d25.zip