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So its a ready-made product and you are trying to reverse-engineer it ?
Not a good thing to do besides its not legal. Why don't you write your own software instead of wasting your time on something which is close to impossible?
I am sure you'll finish writing your software in a shorter time than trying to reverse engineer.
on page 130 that Chip name: AT89C51, Possible
attacks : Fault inj., microprobing,
the Atmel AT89C51 microcontroller. When this became known in the late nineties, Atmel
redesigned the chip layout and improved security to prevent this attack, so that chips
manufactured since 1999 do not have this problem.