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

IPHONE 8 PLUS 12.1.3 16D39

IPHONE_5.5_P3_12.1.3_16D39_RESTORE.IPSW
Categories:
12.1.3
Version:
3.5 GB
Size:
01/22/2019
Date:
Unsigned
Status:
The file can help you a lot ?