IPSW Portal

Choose aProduct→Choose aPlatform→Choose aVersion→ClickDownload

Download 9.9.11.3 (15E5178f) for iPhone 6s+

Version:	9.9.11.3
Build:	15E5178f
Signed:	No
Size:	2 GB
Release Date:	2018-02-06 18:21:26
Upload Date:	2018-02-04 03:18:50
Release Type:	Beta

Secure download directly from Apple's servers