watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

484.25 MB

Release Date

2026-03-24T18:36:09Z

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 4 (40mm) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2026-03-24T18:36:09Z. The update package is 484.25 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 5a6f62f9b6371b0ba110eb4c0b75627b646a9ce3.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72829/707F17B7-ADD9-4B1A-A933-54C144E18C96/com_apple_MobileAsset_SoftwareUpdate/5a6f62f9b6371b0ba110eb4c0b75627b646a9ce3.zip