If you areÂ lookingÂ for a tutorial on how to jailbreak iPhone OS 4.0, here is how to do it with Redsnow 0.9.5. Just follow the below steps.
1. Download and update to iPhone OS 4.0.
2. Download Redsnow 0.9.5.
3. Launch Redsnow.
4. Choose OS 4.0 ipsw ” iPhone1,2_4.0_8A230m_Restore.ipsw ” file.
5. Click on ” Install Cydia ” and click ” Next “.
6. When your iPhone 3G is turned on, you could see a white blank icon in Cydia and sources will be absent in Cydia. Got to Sources Panel and add ” http://apt.saurik.com/cydia-3.7 ” repo. You could see the actual Cydia logo from there after.