IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 5.2.1 (16U5079d) for Apple Watch Series 3 (42mm, LTE)

Version:	5.2.1
Build:	16U5079d
Signed:	No
Size:	0.48 GB
Release Date:	2019-03-28 17:11:14
Upload Date:	2019-03-21 22:17:13

Secure download directly from Apple's servers