@Kirill.Derristy 

Since you are in the UA you might want to repost this on our global commuity because this one is for US customers.  That community link is located here. But this being a general question we can give a general reponse that isn't region based.  

When you physically reset the router you are back to the default admin credentials.  These are printed on the label on the bottom of the router, usually admin/admin.  Once you are in the router you can customize these as well as bind the router to a TP-Link ID.  Binding does not block local access with the admin credential though.  on the log in screen you can switch between the two but a button on the lower right corner.  

One thing that can block access is if you limit what MAC addresses can access the management page.  This can be affected if your device like an iphone, has private Wi-Fi address enabled.  What this feature does is MAC spoofs your phones MAC address, which can cause access issues.  

You can also try to access via the Tether app.  

  @Kirill.Derristy 

Yeah that is not something I am familiar with.  Since it does appear that you are outside the US I would suggest our Global support at support@tp-link.com  they will really be the best source for helping you resolve this.