Originally Posted by geekmaster
The good news is that original full firmware images work on eink kindle demo units.
There is now a success report using the "simple debricking" method to reflash a K5 (touch) demo model with "standard" firmware, restoring full function to it.
That should work on any eink kindle model. At this time, simple debricking (flashing firmware images with USB) only works on K3/K4/K5, so the DX needs to use the old serial port method at this time.
The issue I have with this is that the purchaser of a demo Kindle does not have a licence to use the "normal" firmware, and hence this very likely constitutes copyright infringement. But that is of course not a technical matter, but a matter for the conscience of the owner of the Kindle.