watchOS 4.3

watchOS

Version

4.3

Build ID

15T5209a

File Size

336.79 MB

Release Date

2018-03-12T20:07:21Z

Update Type

Normal release

Delta update - requires 4.1 installed first.

Download OTA

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

About This Update

watchOS 4.3 (build 15T5209a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-03-12T20:07:21Z. The update package is 336.79 MB. This is a delta (partial) update that requires 4.1 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 478516a7b8b611dc567103ed3f26f0bf6f749988.zip.

Direct URL

http://appldnld.apple.com/watchos4.3seed/091-72763-20180221-33B18050-23D3-11E8-8367-EC805B3DAFD9/com_apple_MobileAsset_SoftwareUpdate/478516a7b8b611dc567103ed3f26f0bf6f749988.zip