I have 2 RB2011UiAS-IN units with the EXACT same issues.
not responding to ping, or factory reset.
I was able to use netinstall to install 6.19 but the symptoms do not go away after reboot.
The top LCD is white and has no response to touch what so ever.
The LED port indicator lights are wrong! I have a cable plugged into ETH1, but ETH6 LED is on.
right now its a paper weight and I don't know what to do to get it to work... I have put in my old routers as a bandaid to get these back up and running but they are HORRIBLE routers and just cause more work than they are worth.