Tools required: a mifare card, ACR122UTOOl software
Step 1: Open ACR122UTOOl demo and click connect, as shown below:
Step 2: Click GER ATR as shown below:
Step 3: Load the key. The default is FF FF FF FF FF FF
Step 4: If you verify the password of BLOCK 0X16, which is the 5th sector (block 22), this key is stored in block 23. The key type is TYPE A, B. This example is type A.
Step 5: If the key is successfully verified, that is, the 5th sector, you can operate blocks 20, 21, 22, and 23 (block 23 is the location for storing the key, write carefully) Write 0x15 block (21)
Step 6: Read block 21
Operation of the remaining blocks is the same as above.
