I have the same Problem.. Launcher not reacting, wait or close app. But i cant do anything not even restart, nothink! I have this receiver for about a year and not used much because it makes always problems and with this update nothink works!
EDIT: Is it possible to Reset from Outside? - The Powerbutton also doesnt work!
EDIT: I got it. I could close all open apps, then i could open the menu and im updating now...