watchOS 5.1.3

watchOS

Version

5.1.3

Build ID

16S5531a

File Size

734.96 MB

Release Date

2018-12-19T21:06:13Z

Update Type

Normal release

Delta update - requires 4.3.1 installed first.

Download OTA

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

About This Update

watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-12-19T21:06:13Z. The update package is 734.96 MB. This is a delta (partial) update that requires 4.3.1 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 494adbe23508023a36486dbed7e9fb83d2674ed0.zip.

Direct URL

http://updates-http.cdn-apple.com/2018FallSeed/patches/041-26694/150C44FC-022E-11E9-BC66-D6B1F5B30032/com_apple_MobileAsset_SoftwareUpdate/494adbe23508023a36486dbed7e9fb83d2674ed0.zip