: If the device is old and disconnected from the internet, the story often ends with a screwdriver. You have to open the casing and find a physical "Reset" button or a jumper on the motherboard to force a factory reset, wiping all settings but usually saving the recorded video. Common DVR Login "Characters" (Default Credentials)
Modern systems like Hikvision or Dahua use a "Forgot Password" link on the login screen. Click or the ❓ icon. A QR code will appear on the monitor. dvr login password
POST /api/login "username": "admin", "password": "currentPass" : If the device is old and disconnected