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Before altering any WAN or VLAN settings, navigate to Management & Diagnosis > System Management > User Configuration Management and export a backup configuration file. If your internet stops working, you can simply upload this file to undo the changes.

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For this, you'll need a specialized tool. Several community-developed tools exist for this purpose. Search for "zte_factroymode.py" or similar utilities. You'll typically run a command like python zte_factroymode.py -u admin -p admin --ip 192.168.1.1 telnet in your command prompt. If you encounter an error, try disconnecting the fiber optic cable from the router and then re-running the tool. Before altering any WAN or VLAN settings, navigate