For some reason, wiping fully and installing just stopped working for me all of a sudden. I used to do it all the time, but now when I wipe before installing I get "stuck at the M". The only way I can get back to Android is wiping, installing and then restoring just the data partition from my latest backup. That's how I've been upgrading the past couple of times. Any reason why this would happen? It won't work unless I restore the data partition...