watchOS 5.2.1

watchOS

Version

5.2.1

Build ID

16U5110a

File Size

128.58 MB

Release Date

2019-04-29T17:39:36Z

Update Type

Normal release

Delta update - requires 5.2.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm) →

About This Update

watchOS 5.2.1 (build 16U5110a) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2019-04-29T17:39:36Z. The update package is 128.58 MB. This is a delta (partial) update that requires 5.2.1 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 a10c0837bd7f6a765ee985863ed073cafa9df79f.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SpringSeed/patches/041-59040/5DA36702-686A-11E9-A418-899478A6FCC2/com_apple_MobileAsset_SoftwareUpdate/a10c0837bd7f6a765ee985863ed073cafa9df79f.zip