After upgrade to firmware v1.11.20. and have solid green and txt successful and upgrade on RC I can no longer connect to aircraft.
Any help would be appreciated.

Have you tried to re-bind the controller to the aircraft? There should be directions on how to do this in the manual. Just a thought. I gave up upgrades a long time ago. I'm not saying it is the right thing to do, but it appears it has saved me a lot of grief and kept me from running into these kinds of issues.   Barney