watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

617.21 MB

Release Date

2026-02-02T18:44:23Z

Update Type

Normal release

Delta update - requires 6.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2026-02-02T18:44:23Z. The update package is 617.21 MB. This is a delta (partial) update that requires 6.1 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 4a78a91547746709c7ff587e7580ce11a3b55f4f.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01472/88A56202-C6FA-472D-B45C-C3F7232F2055/com_apple_MobileAsset_SoftwareUpdate/4a78a91547746709c7ff587e7580ce11a3b55f4f.zip