Hi @Anonymous User
Have you still got the old Router ?
If so, or you can remember the old Router SSID Network and Wifi password then use this information on your new Router.
Or if you still have the old Router then just power it up but don't connect it to the internet and leave new Router working as normal.
Then see if the Roku App will let you go into the NOW / Roku player Settings under Network to connect over wifi to your new Router details.
Just make sure the phone or tablet that has the Roku remote App needs to be connected to the old wifi network and password to undertake the above (so you may have to temporary change these settings on your phone or tablet to access the NOW / Roku player Network Settings).
If it was me I would purchase a new Roku player or Fire Stick and use a physical supplied remote controller.
