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 3.1.3 (7E18)

January 22, 2010

227 MiB

iPhone1,1_3.1.3_7E18_Restore.ipsw

Download

Unsigned IPSWs

✗		iPod touch 3	iPhoneOS 3.1.3 (7E18)	January 22, 2010	282 MiB	iPod3,1_3.1.3_7E18_Restore.ipsw	Download
✗		iPhone 3GS	iPhoneOS 3.1.3 (7E18)	January 22, 2010	291 MiB	iPhone2,1_3.1.3_7E18_Restore.ipsw	Download
✗		iPhone 3G	iPhoneOS 3.1.3 (7E18)	January 22, 2010	228 MiB	iPhone1,2_3.1.3_7E18_Restore.ipsw	Download