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

IPHONE 6S PLUS 12.1.4 16D57

IPHONE_5.5_12.1.4_16D57_RESTORE.IPSW
Categories:
12.1.4
Version:
3.3 GB
Size:
01/22/2019
Date:
Unsigned
Status:
The file can help you a lot ?