MS have previous form with this sort of shite..
Not quite on the same scale.. but some baytrail tablets have been bricked by MS updating the firmware on the device.. Reboot.. dead tablet.
The only way to recover the tablet is to reflash the firmware with an external hardware programmer.
One guy has had MS pay for the repair.
See http://linxtablet.co.uk/viewtopic.php?f=36&t=2253