@Bluebell21 Not directly related to your original topic, but you might want to hold off upgrading to 21.02 until 21.02.2 is released. The 21.02 builds released thus far have had a wireless regression with mwlwifi and you will likely experience issues with the wireless radios, most likely a much worse experience than 19.07.
I would consider going back to 19.07 for now or you can run a 21.02 snapshot build which is between 21.02.1 and the unreleased 21.02.2, which has the fix. More info can be found on this thread.
If you aren't using the wireless functions (as you mentioned it's a spare router), then the above is probably not going to be an issue, but thought it was worth letting you know.