[SOLVED] I need to turn a LAN port into WAN on Archer C5400X

[Amigo1982]

Hello,
I need to turn a LAN port into WAN on Archer C5400X. When ISP has troble and sometimes internet collapse i am using a free wi-fi antenna to get free internet. But the router now is placed at very difficult to touch place. And it is very hard for me to unplug ISP cable from WAN and plug WI-Fi cable in WAN port!
I saw that old model TP-Link routers has an option to use LAN as WAN

How to configure TD-W8960N's LAN port work as WAN port(TD-W8960N work with cable modem) | TP-Link France

How to configure TD-W8960Ns LAN port work as WAN port(TD-W8960N work with cable modem)

www.tp-link.com

I do not see my router to have such a settings, checked all menus in advanced tab and no "Virtual LAN ports" etc.
I am with latest firmware and i like this firmware. It has antivirus, firewall. I prefer to not use a custom firmware like Openwrt, DD-WRT...
Tried enabling WAN Aggregation, putting ISP cable in LAN1 port to try whether LAN1 will work as WAN, quote "When enabled LAN1 port will be transformed into additional WAN port. Connect your wired device to other LAN port if any." It looks that WAN aggregation is for other purposes, like connecting two ISP cables, because LAN1 did not worked as WAN and gave me an error "WAN port is empty" after rebooting.
Please help me how to do this? If custom firmware is needed will it has antivirus and the same good performance. I never have had custom firmware.

 

[RealBeast]

The Archer C5400X has no open source firmware. My only thought to make it easier to change sources would be to get a cheap 4 or 5 port switch and plug the WAN cable into it always. Then you can attach one other cables to another port, either the ISP or the free wireless, so it would be easy to change between them. It could also be done in that fashion with an RJ45 to RJ45 coupler (Google that and you will see pictures, and they are under $1).

 

[Amigo1982]

OK, thanks.
But it is a shame 300 USD router and it can`t be done this from the TP-Link web GUI. It looks the old model TP link like TD-W8960N supports this feauture.