Open the SADP Tool. It will scan your network and list the DVR. Check the box next to the DVR-208G-F1 in the list. Click on the right-hand panel.
Disclaimer: This information is for educational purposes for owners of the device. Accessing security systems without authorization is illegal. If you'd like, I can: Help you find the specific download link. Dvr-208g-f1 Default Password
Make a list of these passwords and test each one: Open the SADP Tool