IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 5.3.7 (16U674) for Apple Watch Series 1 (42mm)

Version:	5.3.7
Build:	16U674
Signed:	No
Size:	0.04 GB
Release Date:	2020-05-18 17:31:44
Upload Date:	2020-05-08 18:48:13

Secure download directly from Apple's servers