I have similar problem too with my Network DVR "ANZA Security AZDVR9504", forgot my password.
I found on youtube some videous how to restart recorder with removing the batery etc.
I see it is restarted when I look at the time and date, but it didn't restarted the pasword. I can't make eny adjustments because not eny password works.
I tried with:
000000
123456
admin
NULL
12888
1234
http://fl1.shopmania.org/files/p/rs/m/830/dvr-8-kanalni-mrezni-anza-security-azdvr7508~2661830.jpg
Eny help will be appriciated.
Chears