Regant, As mentioned already, it is recommended to take note of what settings you are using (I usually get screenshots) and factory reset/manually reconfigure the router after upgrading to the newest firmware. Short of this, the settings for Network ...
Ben, This seems like it will be a hardware issue if you can't get anything in the console. Just to verify, have you tried plugging the switch into a network with DHCP? If so, do you get an address? If not, please try this and see if the system light ...