watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

495.93 MB

Release Date

2026-03-24T18:35:50Z

Update Type

Normal release

Delta update - requires 5.1.1 installed first.

Download OTA

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

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2026-03-24T18:35:50Z. The update package is 495.93 MB. This is a delta (partial) update that requires 5.1.1 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 17bc0bab50c8e7cefd59891818427910ca8b6510.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72922/B6B0C7E4-B10E-471F-B3C3-6883AD5CF731/com_apple_MobileAsset_SoftwareUpdate/17bc0bab50c8e7cefd59891818427910ca8b6510.zip