A little late but I thought you might want a solution to this problem.
There were three chips on this device, the first, verified by the manufacturer is the Magtek chip and its function is to read and decode data on the magnetic chip and does not store user created files, the second chip stored the code and did have a small area for storage but did not store any card information. There was no NAND, only an EEPROM which is where the information was stored.
The information is displayed in hex and needed to be converted to binary (the ISO standard for magnetically stored information is guess what....binary )
Once I mapped the memory, the conversion revealed the card numbers.
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