Power the unit on without the battery, then turn it off and reinsert the battery. This often resets the system clock and password to factory defaults. Master Password Generators
The real solution is a physical factory reset (remove CMOS battery or jumper) to restore the default admin / 12345 login. If you cannot open the case or are uncomfortable doing so, contact a local security camera technician – they deal with this issue weekly on OEM DVRs. tronitek dvr admin password
If the defaults do not work, use these recovery options found in most DVR systems: Security Questions: Power the unit on without the battery, then
Contact the vendor or Tronitek support with this information to request a one-time unlock code. tronitek dvr admin password