watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

165.56 MB

Release Date

2026-02-02T18:44:42Z

Update Type

Normal release

Delta update - requires 6.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (44mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2026-02-02T18:44:42Z. The update package is 165.56 MB. This is a delta (partial) update that requires 6.3 to already be installed on the device - it cannot be applied from scratch. This update is currently signed by Apple, so it can be applied directly from Settings › General › Software Update.

The OTA payload file is 50540a9ccf506017df5d5701918c20ecf8dfef72.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01462/13D32474-8392-4E3B-9E48-10CABAC80033/com_apple_MobileAsset_SoftwareUpdate/50540a9ccf506017df5d5701918c20ecf8dfef72.zip