How to reset the ACE-GTW-4G to the factory default settings?

Your ACE-GTW-4G is OFF (Do not press the reset button)
Turn ON your ACE-GTW-4G
Wait about 2 seconds until almost all LEDs turn OFF
Press and hold the reset button for more than 10 seconds
Release the reset button

Be patient until you can reach it at the default IP address http://192.168.8.1

The device will do a hard factory reset and then reboot. This operation can be slow, so wait a few minutes before connecting again.