watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

512.5 MB

Release Date

2026-03-24T18:34:40Z

Update Type

Normal release

Delta update - requires 5.1.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (38mm, LTE) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2026-03-24T18:34:40Z. The update package is 512.5 MB. This is a delta (partial) update that requires 5.1.3 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 d86c394a81df260bf87f233d3542d04fbfb8c0b9.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-73073/825781D7-09CE-4F22-B284-231759C7F8C8/com_apple_MobileAsset_SoftwareUpdate/d86c394a81df260bf87f233d3542d04fbfb8c0b9.zip