I installed the latest Beta OS on a RouterBOARD 133 and I cannot get control of the device anymore. It worked great with 2.9.43 but after the change to the beta the console permits login but gives no command prompt and WinBox connects, downloads plugins, but stops forever just before it opens the main window.

How do I return this unit to operation when I cannot get into it via serial or ethernet? Netinstall doesn't work either.