And I already know how to install firmware on TP link routers. I had a router from a provider with firmware that only supported the Internet from this provider, and after moving I had to install universal firmware from the official website so that the router would work with a new ISP.
Don't try to appear smarter than you really are. All Google instructions do not indicate how to create a server ON A SPECIFIC IP, there is generally no emphasis on IP. They offer to choose the one that is given. That's why I'm asking HOW TO MANUALLY SET IP? If it were not necessary to install the firmware according to your instructions, then I would not have asked.
What interface are you talking about? I have never chosen my own IP. An external IP is given to me by my network provider, and I can register an internal IP with a router. But what about interfaces? If you do not understand this issue, then it is better not to write anything at all. I'll wait for really knowledgeable people.
How interesting. I disconnected the router from the Internet, disconnected the Wi-Fi in the router. I changed the router address from 192.168.1.1 to 192.168.0.1 after which I was able to change my internal IP to 192.168.0.68
And after that I kind of managed to flash the router