I tried it and it didn't work, but I might have done something wrong. If it's definitely possible, I can try again.
• I know I entered the correct MAC address into the router, but perhaps I can try a different IP4 Address.
• Maybe I need to restart the router after I enter the Roku's MAC address?
I do not have a Roku remote. This is why I'm trying to do it this way. Since the Roku is not connected to the WiFi, the remote on my mobile Roku app won't work, either.
Yeah... give it up. It can't be done without a remote.