Bad values

[Aidabs]

Hello. . When i try to read main, protected or security memory it's displays FF to all values. I use ACS38 card reader to communicate with Arduino.

[zhao-rui-NB]

This is going to happen because the clk frequency of the ACS38 is too high for the MCU, and the problem was detected at that time, but fortunately on the target machine he operated at a lower frequency.