now, I read up on this, and I learned that on your 3DS, there is an emergency backup on your system. Nintendo warns you to plug in your 3DS to a wall so that it doesn't die and corrupt the files. But, doesn't that mean that the backup will load if it is corrupted? So all you would have to do to revert back to whatever firmware you're from is to take out the battery, plug in your system, and then get the installing started, and then unplug. that will imedetly shut down the system, corrupt the files, and then the backup can do it's job. If your lucky, the backup would be a previous firmware, and you can do whatever you want with that firmware. just a theory that I don't think nintendo can stop.