A warm welcome here in the Roku Community, @Dtayylor.
Thanks for raising your concern and appreciate you trying to utilize your ethernet and wireless connections to try and update your Roku TV.
Kindly visit our support article on How to use USB to update your unconnected Roku TV system.
Let us know how it goes. Hope this helps!
Best regards,
Carly
Carly Y.
Roku Community Moderator