With the AT&T’s new unlock policy in place, many users who have completed their contract might have submitted request to unlock their device. But if your iPhone is already jailbroken then before officially unlocking your phone, it is suggested to re-jailbreak your device with redsn0w with “Deactivate” Option, as warned by hacker MuscleNerd.
As the unlock can conflict with the jailbroken devices, MuscleNerd has provided an solution that the users must first run the Redsn0w jailbreak with “Deactivate” option checked on Jailbreak screen. This will avoid restoring your device and refrain your device from losing the jailbreak, after successful unlock.
If you have already raised ticket to AT&T, don’t panic as you still have time to re jailbreak, as it is taking around a week’s time to get the email or the unlock code. But to avoid any further delays, you must make your device jailbreak safe as soon as possible with redsn0w.