watchOS 5.3.1

watchOS

Version

5.3.1

Build ID

16U600

File Size

883.72 MB

Release Date

2019-08-26T17:16:02Z

Update Type

Normal release

Delta update - requires 4.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm, LTE) →

About This Update

watchOS 5.3.1 (build 16U600) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-08-26T17:16:02Z. The update package is 883.72 MB. This is a delta (partial) update that requires 4.2 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 e09f44dd3d66fc24bc1803a1025e5f8247926a0f.zip.

Direct URL

http://updates-http.cdn-apple.com/2019SummerFCS/patches/041-91957/88E57CCC-C501-11E9-A207-CEFDA3360C2F/com_apple_MobileAsset_SoftwareUpdate/e09f44dd3d66fc24bc1803a1025e5f8247926a0f.zip