Do not use old 2014 software. Search for "TVT Reset Tool v3.0.1 fixed" from official distributor archives or trusted security forums. The file should be named something like TVT_Pwd_Reset_Fixed_v2.5.exe . Scan it with antivirus before running.
Common reasons users get locked out include: Tvt Dvr Password Reset Software Fixed
Ensure that the software is compatible with your specific DVR model. Using software that is not compatible can lead to further complications. Do not use old 2014 software