i have a ds1991 ibutton. it is on a machine and it works as a counter. they told me that it comes with a 10000 shots and every time they press the the button the counter goes -1. the ds1991 i have in my hands is with 0 shot on it and my question is, can i read the memory and find where they wrote the bytes? and can i write them? at the moment i found the way to read the family,SN and CRC but i cant read data from scratchpad or subkey , it always give FF. maybe i do something wrong or i cant read them without password?
this is the results in the monitor. R=2 34 33 DF 00 00 00 1A P=1 FF FF FF FF FF FF FF FF FF CRC=C9
im not sure if the code is ok, im newbie. i just used other codes and changed some parameteres.