In order to factory reset the GS710TUP switch but maintain NETGEAR registration status, press the RESET button on the front panel (left side) for 5 seconds. You can press the button for any time between 5 and 9 seconds, but do not press the button for more than 10 seconds. Pressing the RESET button for more than 10 seconds will perform a factory reset but also delete the registration status.
Source: GS710TUP user manual