watchOS 6.3

watchOS

Version

6.3

Build ID

17U216

File Size

126.81 MB

Release Date

2021-01-26T18:26:51Z

Update Type

Normal release

Delta update - requires 6.2.5 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm) →

About This Update

watchOS 6.3 (build 17U216) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2021-01-26T18:26:51Z. The update package is 126.81 MB. This is a delta (partial) update that requires 6.2.5 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is dfab4e768a2b955f58fe4127501addad7c33fba8.zip.

Direct URL

http://updates-http.cdn-apple.com/2021WinterFCS/patches/001-88826/3F2CCE7D-C6B5-4BEC-A021-4AEE50075204/com_apple_MobileAsset_SoftwareUpdate/dfab4e768a2b955f58fe4127501addad7c33fba8.zip