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

IPHONE 6 PLUS 12.31 16F203

IPHONE_5.5_12.3.1_16F203_RESTORE.IPSW
Categories:
12.3.1
Version:
3.3 GB
Size:
05/22/2019
Date:
Unsigned
Status:
The file can help you a lot ?