watchOS 5.1.3

watchOS

Version

5.1.3

Build ID

16S5531a

File Size

146.85 MB

Release Date

2018-12-19T21:06:33Z

Update Type

Normal release

Delta update - requires 5.1 installed first.

Download OTA

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

About This Update

watchOS 5.1.3 (build 16S5531a) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2018-12-19T21:06:33Z. The update package is 146.85 MB. This is a delta (partial) update that requires 5.1 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 cd393a401644ba2c59b3cab20d997375f8f396e3.zip.

Direct URL

http://updates-http.cdn-apple.com/2018FallSeed/patches/041-26713/D0781028-022D-11E9-B3E3-F7F8FD4E2BCC/com_apple_MobileAsset_SoftwareUpdate/cd393a401644ba2c59b3cab20d997375f8f396e3.zip