iPhone iOS Firmware iPhone ipsw firmware download that provided by Apple, when you do the relevant operation at your own risk.

IPHONE 6S PLUS 11.4

IPHONE_5.5_11.4_15F79_RESTORE.IPSW
Categories:
11.4
Version:
2.72GB
Size:
May 30, 2018
Date:
Unsigned
Status:
The file can help you a lot ?