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You can download hactivated Custom IPSW for 4.3.3 with untethered jailbreak and use it to restore via iTunes on iPhone 3Gs with 06.15 baseband. See 'Update' at the bottom.
Finally, I decided to upgrade my iPhone OS from 4.2.1 to 4.3.3. All thanks to Dev-Team members and Sn0wbreeze to make possible the installation,...