Is your Linksys RE6400 setup now confronting blinking light troubles? To troubleshoot the blinking light issues for Linksys WiFi extenders, follow the instructions. Restart your Linksys WiFi extender first, and then disconnect all devices connected to it. Check whether the extender is located in the coverage area of the main router. If not, move the extender nearer to the router and then restart it. Check whether the connection between the extender and router is firm. Test the stability again by connecting the extender to the router using a wired Ethernet connection. If all of the steps mentioned above fail, the next option would be to reset the extender to factory default settings. Press the reset button located at the back of your extender for ten seconds before releasing it. Allow a few moments for the LED light on your extender to stop flickering and stay on continuously. After the reset procedure is complete, reconnect the extender to the router either using the WPS button or through a web address. Update the firmware for the extender onwards if the issue still arises. This will guide you in resolving the blinking light issue for the Linksys WiFi extender. Otherwise, please contact any technician for further assistance.