How do I reset the AC750 Range Extender to factory defaults?

You can reset the extender in two ways: (1) Use the Reset button by inserting a straightened paper clip into the hole and holding it for about seven seconds until the Power LED lights amber, then release and wait for the extender to reboot (about one minute), or (2) Log in to the extender web interface, go to Settings > Other, and click the RESET button. Note that this erases all your custom settings.