Signed IPSW files can be restored via iTunes. Unsigned IPSWs cannot currently be restored via iTunes.
✗ | iPhone 3G[S] | iPhoneOS 3.1 (7C144) | 3rd September 2009 | 321 MB | iPhone2,1_3.1_7C144_Restore.ipsw |
✗ | iPhone 2G | iPhoneOS 3.1 (7C144) | 3rd September 2009 | 253 MB | iPhone1,1_3.1_7C144_Restore.ipsw |
✗ | iPhone 3G | iPhoneOS 3.1 (7C144) | 3rd September 2009 | 253 MB | iPhone1,2_3.1_7C144_Restore.ipsw |