Upgrade your unlocked iPhone to 3.1.2

It really couldn't be easier:

1. Run AptBackup and tap Backup.
2. Run iTunes on your PC and install the new firmware.
3. Run blackra1n on your PC and click the button.
4. Run blackra1n on your iPhone and install Cydia.
5. Run Cydia. Install required updates, then install AptBackup.
6. Run AptBackup and tap Restore.
7. Run Terminal and change your default passwords for users mobile and root!