@Neshcz I appreciate that, actualy I am not much of a gamer and apart from that don't have that spare time. I am glad that I was able to assist in some way.

I believe that TP-Link would address your question.

@Woody So, your configuration done from scratch, has nothing to do with the 1.0.0.0/8 route, right ? Sorry, no, I am not with the TP-Link support, but I believe @Kevin_Z can advise on that, when he...

You can try that as well, if it's not too much of an effort configuring it from scratch. Then you can observe if the 1.0.0.0/8 route will be there after resetting to factory defaults.

If you're sure that you remember your password correctly, see if you are using proper alphabet or check Caps Lock button on your keyboard while typing the password. If you don't remember it, but you...

Try to set the DNS 1.1.1.1 in DHCP server settings. In Internet options - set Get Dynamically from ISP, reboot the router and see if 1.0.0.0/8 route is gone, then do some browsing test.