There are few others who have this "problem" also, that there is not coming anything looking like DES encryption after the string "lock_code" in /dev/mtd1 I wonder, if this is a patent thing, and in some parts of the world Nokia has indeed used other encryption than DES. Or if it indeed is some kind of fortunate seldom triggered bug, that makes the device harder to crack. And forgot to mention, I have in settings, that in 10 minutes of idle usage, the device will lock itself with the security code. I think that is why it asks the security code every time it boots up, also after full rootfs+rMMC reflash. I guess people normally do not have that auto security lock enabled and haven't noticed it does survive over reflash also. (which seems to be a good thing).