Download iOS 3.1.3 for iPhone 3G (iPhone1,2)
Signed IPSW files can be restored via iTunes, 3uTools. Unsigned IPSWs cannot currently be restored via iTunes, 3uTools.
Signed status can change daily, you should check signed status before restored
Firmware information
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File name
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VersioniOS 3.1.3 This firmware is unsigned. You can not restore to it
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Build ID7E18
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Size228.06MB
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Release date
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Upload date2010-01-22 01:49:43
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MD5
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SHA1
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SHA256
iPhone 3G
iPhone1,2
* Apple server is official from Apple. Other links are re-upload to other hosts.