I looked at the other threads but cannot follow it and I have limited computer skills.
It was hacked. Password was changed and cannot be reset. I cannot access many of the features.
I upgraded it 4.0 but the password was still locked.
Password was pre-populated with many +++++++
Did a factory reset but password remains the same - will not accept any input.
I was able to use the keyboard to back space all the +++ and entered 1111aaaa but it did not take.
However because of all the attempts, I have lost all passwords.
Model DS-7616-NI-I2
I was able to activate it via SADP
Again the password field is pre-populated with many ++++ and will not accept change using the mouse.
UPDATE
As of now, the NVR is booting up as 4.0 and asking for admin password.
I have no idea what the password is because of the many attempts to fix it.
SADP can see the NVR but don't know SADP or NVR password.
I did try SADP import file but it failed to change the password.
So I am stuck at the NVR password
I do believe that the tool to re-create a security key using the serial number and the system startup date can help me but i could not find a link to download it.