Here you can find a picture of the label and what shows on the screen when it boots up.
Yes, it is old and I also have doubts if it is worth to work on reseting it or not... but, I think, if I can safe it I can use it for a small country house (nothing fancy) because I have also a set of 4 cameras that was used with this equipment and which still work.
P.S. I tried with the empty password and it did not worked