Before trying technical resets, check the most common defaults if the unit was never properly secured: Common Codes , or even just leaving the field blank. Hoosier Security Pro Tips for Next Time GUID Files
Some generic XM or HiSilicon-based DVRs have hidden backdoors:
This will erase all settings (network config, motion detection zones, user accounts), but it will NOT delete your recorded video footage on the hard drive. Your recordings remain safe.
