You can make a backup prior to reflashing.
Problem being: if there is something weird in your settings, restoring the backup would bring that s**t back in...
I would go for a clean re-flash; then set things up again, manually. Checking at every step - that is: not do more than one change at a time, reboot, and clear that setting-change out as good-to-go-with.
Problem being: if there is something weird in your settings, restoring the backup would bring that s**t back in...
I would go for a clean re-flash; then set things up again, manually. Checking at every step - that is: not do more than one change at a time, reboot, and clear that setting-change out as good-to-go-with.