iroomba 675 (and others) only connects to 2.4 ghz routers. If, like me, you have a 2.4/5 ghz router you need to shut off the 5 ghz part in the router during setup, then you can turn it back on after setup... (you have to google or call isp if you don't understand how to get into your router). If your router doesn't have 2.4 ghz then you will NOT be able to connect to it. Only solution would be to get a router with 2.4 ghz. gl