watchOS 5.2.1

watchOS

Version

5.2.1

Build ID

16U5091b

File Size

442.4 MB

Release Date

2019-04-08T17:13:16Z

Update Type

Normal release

Delta update - requires 5.1.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (44mm) →

About This Update

watchOS 5.2.1 (build 16U5091b) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-04-08T17:13:16Z. The update package is 442.4 MB. This is a delta (partial) update that requires 5.1.2 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 ab43929ea3737c0753c9d20fb2ba0bcf1a35ca99.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SpringSeed/patches/041-54457/8B487752-5716-11E9-B456-E1B9C8039C47/com_apple_MobileAsset_SoftwareUpdate/ab43929ea3737c0753c9d20fb2ba0bcf1a35ca99.zip