Amazon support has been less than helpful, and all attempts to resolve the issue have been unsuccessful. As of right now, it appears to be bricked, but there doesn't seem to be any way to restore the firmware in this state (it just boots directly to the error message after flashing the white Amazon logo onscreen for a few seconds). Pressing back and right on the remote (Amazon's only trouble shooting step, aside from changing my HDMI cable?!?) and the ALT+PrtScr+I to get to recover mode don't seem to be working. I've had devices bricked by updates before, but this is the first time I've had support tell me that a botched update isn't covered by the terms of the warranty.