watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

159.14 MB

Release Date

2026-03-24T18:35:03Z

Update Type

Normal release

Delta update - requires 5.2.1 installed first.

Download OTA

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

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2026-03-24T18:35:03Z. The update package is 159.14 MB. This is a delta (partial) update that requires 5.2.1 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 a7646ba014f099e9e6c56c1995eb169a8cd6e6b9.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72863/8082892E-B3B1-4696-9510-BFC33DE7FA3C/com_apple_MobileAsset_SoftwareUpdate/a7646ba014f099e9e6c56c1995eb169a8cd6e6b9.zip