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The 2GB of internal flash memory of the KT provides 3 partitions:
/dev/mmcblk0p1 is the root partition (about 256MB)
/dev/mmcblk0p2 is the rescue partition (about 256MB)
/dev/mmcblk0p3 is the user partition (about 1.4GB) and contains the books and other user files
So the system with all firmware upgrades is entirely contained in the root partition.
The rescue partition contains a copy of the root partition with the original firmware (mine has a 1.9.0)
If you make a mistake in the root partition, just perform a factory reset (keep the button pressed while booting) and the rescue partition will be copied to the root partition. The books in the user partition will also be removed.
So, as far as I know, it is not possible to put the KT in a non-recoverable state as long as the rescue partition is not modified.
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