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The simplest way is not to use tp-link registered id and password and go back to using admin to log in.

How? If you are like my case, once turn off the power and on, you can log in using tp-link registered id and password, after you log in, just go to "basic" --" tp-link cloud", untie it, then you can always log in using admin (it's better to change a password).

Yes, you cannot use tether app to control your router, and you cannot use tp-link ddns service. But I just want to be able to log in anytime I want.