@TKwsNi Go through this thread to see how you could mitigate this problem.

@BalintN Basically you should be able to modify/remove these Address Reservations entries from the router's WebGUI:

@Anoni Check this thread to find an answer to your question.

@Lilia_Ivanova.. Have you tried to hard reset the device (using method 1) ?

@Reddirtdog What you can do is to change your router's password with a stronger one. Also change your wireless password with a stronger one and be sure that only you know these two. For wireless...

@Diggz Here's how to reset the router to factory defaults (using method 1). If after successful factory defaults reset you still don't have access to devices's web management interface, contact your...