watchOS 5.1.3

watchOS

Version

5.1.3

Build ID

16S5523a

File Size

148.37 MB

Release Date

2018-12-10T18:10:33Z

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 16S5523a) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2018-12-10T18:10:33Z. The update package is 148.37 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 99b148489074378ec8723edf98e98bc74835310d.zip.

Direct URL

http://updates-http.cdn-apple.com/2018FallSeed/patches/041-24161/80D695CE-F8DE-11E8-A5A4-99040CE3CFB3/com_apple_MobileAsset_SoftwareUpdate/99b148489074378ec8723edf98e98bc74835310d.zip