I assume you have connected your RUTX11 to another access point in client mode by pressing the SCAN button. Is that correct? Considering that you did not change anything else, you should be able to have internet access as WiFi and LAN ports are under the same logical interface br-lan by default. So if you connect to the RUTX11 via WiFi and get internet access, then, you should be able to access the internet from the LAN port as well.
Have you tried restoring the device to factory settings in System → Backup?
If it does not help, could you share the configurations you did? But before sharing, please, blur any sensitive information for the privacy purposes.