Hey Sali1981,
Your only solution is to reset your firewall to the default factory settings so you can log in to make changes to your firewall, the steps to do so are below:Press the reset button on the back until the test light blinks. This takes about 10 seconds. (To avoid accidental resets, the small button is recessed. Use a pen or paperclip to access it.)
Release the button.
Wait for the router to reboot.
Log in with the default password.
If the router was not cleared, try these additional steps AFTER the router has finished rebooting.Unplug the router's power.
Press and hold the reset button. While the button is held down, reconnect router's power.
Continue to hold the reset button for 20 seconds after reconnecting the power.
Wait for the router to reboot.
Log in with the default password. The default username is admin and the password is either password, 1234, or admin.
Hope this helps,
AJZ