Reset Button

The reset button is located on the back panel of the device:

The reset button has two functions:

• Reboot the device. If the reset button is pressed for up to 4 seconds, the device will reboot. Start of the reboot will be indicated by the flashing of all 5 signal strength LEDs together with the green connection status LED.
• Factory reset. If the reset button is pressed for at least 5 seconds (by default), the device will perform a factory reset and reboot. Signal strength LEDs indicate the elapsed time while holding the reset button. When all 5 LEDs light up, it indicates that 5 seconds have passed and the reset button can be released. Start of the factory reset will be indicated by flashing of all 5 together with a red connection status LED.
  NOTE: the default button hold time value (5 seconds) can be changed in the router's WebUI, from the System → Administration → General page.

WebUI

You can also perform a factory reset from the router's WebUI. To do so, login to the router and go to the Administration section found under the System tab (System → Administration → General). In the very bottom of the page there's a Restore button that performs a factory reset on click:

SMS

You can perform a factory reset with the SMS Utilities restore rule. If the rule hasn't been disabled or changed in any way, all you need to do is send an SMS message to the router containing the text:

<router_password> restore