Please reset cusadmin password to default

While back I changed the password on the modem after 10 times been using the default cusadmin for Username. Enter highspeed or CantTouchThis for Password.

We have 3 DVR hooked up to the modem. one of our DVR went bad and we got new one and as far as I remember for sure my password it will not log me in no matter what I put in for password.

I even tried the default password and it didnot work.

I do not want to reset the modem because I will lose all port forwarding with my good DVR that I already have it hooked up. The company that make those DVR have set them up the first time as courtesy and it did take long time to set them up.

Please help