How to change the Default WAN port (X1) to some other port?

Hi Team,
Greetings...
In NSA2400 by default the X1 is the WAN port.
In my FW that port is having some issues. How to change the Default WAN port to some other port?
Category: Mid Range Firewalls
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@Thirunavukkarasu
Follow the below KB & once it done, Navigate to Network-->Failover & LB-->Default LB Group and add the new WAN interface into the LB group.
@Ajishlal Thanks for the reply.
Is there any way to configure the default WAN in some other ports?
The article describes about the secondary WAN interface.
I need to configure the other ports as primary default interface
Thansk and Regards
Thirunavukkarasu