har någon testat nedgradera sitt baseband? med denna metod kolla sidan
http://forum.gsmhosting.com/vbb/showthread.php?t=685297
http://www.yellowsn0w.net/
läs kommentar 29 på sidan säger samma sak
det jag menar då är alltså
How to Downgrade Baseband 2.30.03 to 2.28.00
Please download the application via Cydia MobileTerminal
Download this file and unpack it http://rapidshare.com/files/198571862/iPhone_3G_02.28.00_baseband.zip
Copy the folder over SSH in / var / root /
Launch Terminal on the iPhone and go to the directory where you uploaded the files
Write: su
Enter the password: alpine
Type: chmod 755 BBUpdaterExtreme
Write: launchctl unload /System/Library/LaunchDaemons/com.apple.CommCenter.plist
Type: ./BBUpdaterExtreme update -f ICE2_02.28.00.fls -e ICE2_02.28.00.eep
Restart the iPhone