Holy crap, commentor Jared gave me instructions on how to revive my dead mobiBLU, and it worked! It took 30 minutes of installing, flashing, rebooting, reinstalling, etc but now that it is done, the cube is once again alive. Thank you Jared! I should note that I left a voice mail with mobiBLU support, who never got back to me. A random guy on a comment thread did far more for me than the company that I am a customer of. I still don't recommend that anyone sink their money into these things but I'm glad this one is no longer a (tiny) brick.