Not sure if this is what you're looking for (I don't have a UDM Pro) but here are the steps for WAN port remapping on the UDM Pro. 1. Navigate to the Devices > UDM > Ports > WAN > Configure Interfaces section to assign the WAN networks to the ports. 2. If the WAN network is not listed, then create it first in the Settings > Internet > WAN Networks section. 3. To switch the WAN Networks, first change the Port WAN1 Network from WAN to Disabled, then change the Port WAN2 Network from WAN2 to WAN. 4. Finally, change the Port WAN1 Network from Disabled to WAN2 and apply the changes. 5. Navigate to the Devices > UDM > Details section to verify that both WAN interfaces are up and have an IP address assigned.