Note: Hard reset will remove all your settings, and your device will be restored to factory default settings. Do not perform a hard reset unless you have backed up your settings or you can do the configuration again.
Turn off the switch (pull the power out of the device).
Press and hold the reset button on the front panel with a pin, while holding down the reset button turn on the switch (plug the power back into the device), please keep on holding down the reset button for approximately 10 seconds.
Release the reset button and wait for the device to reboot.
1.After the hard reset, the IP address of the device should be changed to the default 192.168.0.1, and the default login username and password are both supervisor (all lower case).
2. Ensure that the IP address of your computer is in the same IP range with the device. That means your computer should have an IP address like 192.168.0.X(X is in range of 2~253), and the subnet mask is 255.255.255.0.