Red light = your extender is too far from the router or just not getting a signal. Before you go nuts trying to reset stuff, move the damn extender closer. Seriously. Plug it in halfway between the router and the dead zone you’re trying to fix. Wait like 30 seconds. If it turns orange or green, you’re good. If it’s still red, keep reading. https://wifi-linksys.com/resolve-linksys-red-light-error-with-extender-linksys-com-setup-steps/