Apple has reacted quickly to rectify the issue with their activation servers that allowed iPhone owners to unlock their devices, but fortunately it is possible to restore the tickets and use them to unlock the iPhone again, something that will be extremely useful in case the user needs to restore the device for one reason or another.
Step 1: Locate the SIM card that was used during the initial unlock process. This is the unofficial SIM card, not the SIM that was provided by the official network.
Step 2: Open up the iFunbox on your Pc or Mac and use it to navigate to the /var/root/Library directory.
Step 3: When you are in the directory select the Lockdown folder and copy somewhere.
Step 4: For using SAM Activation Ticket to unlock just replace Lockdown folder with your backup folder ! and just on and off airplane mod
Download iFunbox : Windows / Mac
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How to Unlock with SAM