IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 5.1 (16R5568d) for Apple Watch Series 4 (44mm)

Version:	5.1
Build:	16R5568d
Signed:	No
Size:	1.33 GB
Release Date:	2018-10-02 17:15:12
Upload Date:	2018-09-27 17:01:19

Secure download directly from Apple's servers