watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

505.72 MB

Release Date

2026-03-24T18:36:58Z

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 (44mm, LTE) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2026-03-24T18:36:58Z. The update package is 505.72 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 3f40bbca8a4704b3e59eca86c31a5c0e83c67790.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-73068/1D4E2465-F2B3-406C-A159-ED2C1DC8FAD1/com_apple_MobileAsset_SoftwareUpdate/3f40bbca8a4704b3e59eca86c31a5c0e83c67790.zip