I have iPhone 3GS firmware 3.1.3 version, have downloaded sn0wbreeze-V1.5.1 to jailbreak my iPhone 3GS 3.1.3 using iPhone1,2_3.1.3_7E18_Restore.IPSW and it has created sn0wbreeze_iPhone 3G.IPSW using simpe method option in tool sn0wbreeze-V1.5.1.

When I try to restore using this sn0wbreeze_iPhone 3G.IPSW to jailbreak my device and it is showing "iPhone XXXXX could not be restored because the firmware file is not compatible".

Please advice/help me to jailbreak & unlock my device. Thanks!