watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

260.8 MB

Release Date

2026-02-02T18:44:39Z

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 4 (40mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2026-02-02T18:44:39Z. The update package is 260.8 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 9716247bcb656fa2e7c98dc5ea9b95cc86cfaeef.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32166/47B07FBF-D3B2-41D9-A4DE-E52989332121/com_apple_MobileAsset_SoftwareUpdate/9716247bcb656fa2e7c98dc5ea9b95cc86cfaeef.zip