If software methods fail, you can force the DVR back to factory settings using the motherboard:

First, Marcus tried the digital route. He clicked on . The screen popped up with a Serial Number and the current system date. He remembered reading that some technicians use a "Super Password" generator. He grabbed his phone and searched for a DVR password calculator .

If none of the above work, you may need an authorized reset file (often an XML or GUID file).