I would remove the node to reset it. Reset the router, configure it, and add the node.
Then if you decide to go back, flash the node and remove it to reset it. Flash the router, reset it, configure it, and add the node.
When possible, I use the webUI restore/Initialize to reset the router and purge logged data... for a bit cleaner install.
I would not restore a saved configuration if you are troubleshooting an issue. https://www.snbforums.com/threads/faq-nvram-and-factory-default-reset.22822/
OE
Thanks.
That thread is a treasure.
Will give it a try this weekend. I want to take my time, so I don't rush anything.