A blinking red light on your D-Link Wi-Fi extender usually signals a connection issue between the extender and your main router. This can happen due to poor signal strength, incorrect setup, or outdated firmware. To resolve this issue, first check the distance between your extender and router—make sure it's placed within a reasonable range to receive a strong signal. Next, try rebooti... https://dlinkapnet.net/how-to-fix-d-link-extender-blinking-red-light/