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

IPHONE 3G 4.2.1

Download
IPHONE1,2_4.2.1_8C148_RESTORE.IPSW
Categories:
4.2.1
Version:
322.89 MB
Size:
November 19, 2010
Date:
Signed
Status:
The file can help you a lot ?