If the device can’t work properly after parameters modification (typical case is after modifying the IP address which makes network not accessible to the device), you can restore the factory settings to restore the device configuration to the default parameters.
Two Ways of Restore Factory Settings:

1. In Web page, select “System Setup”> “Restore”
2. RESET Button: Press the reset button at the bottom of the device and hold for more than 5 seconds. The device will be restored to the factory settings. Restoring the factory settings will lead to a hard reboot and the reboot process will take approximately 1 minute.