do you have shsh files (either 3.1.2 or 3.1.3)? if you have you can restore your iphone back to 3.1.3 . you can follow this guide except that you use a 3.1.3 ipsw for your restore.Now my iPhone 3G on OS 4 shows the lock screen for about 10 seconds before it crashes and reboots. I'm so frusterated![]()
http://www.ihackintosh.com/2010/02/downgrade-iphone-3gs-os-3-1-3-to-3-1-2-with-cydia-shsh/