[frostschutz]

@cramoisi: Please try it and report back.

@Ken: Not sure if I understand your idea. This is about backing up books and database? Cause the regular reset is always available after all (and if that doesn't work, hold power button + tap the bottom screen corners). As for books+database it's just a matter of making a copy through USB, is that not simpler?

Or do you mean just pulling the system partition from the external card, not touching bootloader/recoveryfs? Cause if you include those, a brick is nearly guaranteed since the mod has no way of verifying that whatever is on the external card, will actually work at all.