Signed IPSW files can be restored via Finder, the Apple Devices app, iTunes, or idevicerestore. Unsigned IPSWs cannot currently be restored to.

Signed IPSWs

✓

iPhone 2G

iPhoneOS 3.1 (7C144)

September 3, 2009

241 MiB

iPhone1,1_3.1_7C144_Restore.ipsw

Download

Unsigned IPSWs

✗		iPhone 3GS	iPhoneOS 3.1 (7C144)	September 3, 2009	306 MiB	iPhone2,1_3.1_7C144_Restore.ipsw	Download
✗		iPhone 3G	iPhoneOS 3.1 (7C144)	September 3, 2009	242 MiB	iPhone1,2_3.1_7C144_Restore.ipsw	Download