Longse systems utilize various firmware versions depending on the year of manufacture and the specific interface (often the "XVR" or "AHD" interface styles). Consequently, the reset method that works for a 2016 model might not work for a 2023 model.
Before attempting a full reset, test the standard factory default settings. Many users forget these are often not changed during initial setup: admin Password: 12345 or 123456 Older Legacy Password: admin or sometimes just left blank 2. Use the "Dynamic Password" Method longse dvr password reset