I've just dumped a 512MByte file containing a certain byte sequence. Now I'll just search for 4MByte (erase size?) continuous patterns of that sequence on the /dev/mmcblk0 device (as far as I could see from dumping, its first 16 MByte were completely identical to the contents seen from a running system). Then I use ATK again to see if I get the expected sequence and then, if I feel lucky, try to flash something else to that location. I'll keep this thread informed.
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