watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

314.93 MB

Release Date

2026-02-02T18:44:07Z

Update Type

Normal release

Delta update - requires 6.2.5 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 2 (38mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2026-02-02T18:44:07Z. The update package is 314.93 MB. This is a delta (partial) update that requires 6.2.5 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 cdb77fcc600874d45aa46e650cf41ed68c37a90f.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32120/18504E85-EE77-4E0B-AC79-1D0EF0366BEB/com_apple_MobileAsset_SoftwareUpdate/cdb77fcc600874d45aa46e650cf41ed68c37a90f.zip