Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 122)

ADSL2/2+ Router
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4.5.7 Restore default
If you have made some illegal operation on the device, you will be
unable to access the Internet. This feature enables you to restore the
device to factory default settings.
1. Click “Restore Default” to display the “Tools -- Restore Default
Settings” screen.
2. Click the Restore Default Settings button, and click “Ok” on the
appearing dialog.