@MarcoDzz That's not the way that REs work - see more details in this thread.

@Barra8 If you change the modem then it's better to reset your RE650 and re-configre it from scratch. To reset the RE press the reset button for about 10 seconds.

@satimis As long as you have an access to the router web management interface (via wired computer) you can check what's the wireless password, no matter if you changed it or not. If you don't...

@satimis " Can I perform this step on a wire-connected computer in this network? ". That's the whole idea - to login the router web management via a wired computer and check what the wireless...

@satimis I still didn't get which password you forgot - wireless password for your router or its web management (administrator) pasword. In either case if you follow the appropriate guide from my...

@satimis If you forgot your router wireless password, follow this guide to recover it. If you forgot your router web management password then follow this guide.