title: APDU Write block commands on mifare 1K with ACR122U reader
body: <p>Please, </p>
  
  <p>I am trying to write a simple Binary Block to mifare 1k tag with a ACR122U  reader.</p>
  
  <p>I am trying write to block 01, 5 bytes, text:'teste' and read it back.</p>
  
  <p>But I always get an error 6300 when update this block.</p>
  
  <p>Any thoughts? </p>
  
  <p>I am using windows 8.1/delphi xe8. </p>
  
  <p><strong>My log is:</strong></p>
  
  <pre><code>SCardEstablishContext succeeded.
  Card State changed in ACS ACR122U PICC Interface 0 to available
  New reader found: ACS ACR122U PICC Interface 0
  Card inserted in ACS ACR122U PICC Interface 0
  ATR = 3B 8F 80 01 80 4F 0C A0 00 00 03 06 03 00 01 00 00 00 00 6A
  SCardConnect (shared) succeeded.
  Active Protocol: T=1
  ISO 14443 A, Part3 Card Type: Mifare Standard 1K is detected
  Sending APDU to card: FF 82 00 01 06 FF FF FF FF FF FF
  SCardTransmit succeeded.
  Card response status word: 9000 (OK)
  Sending APDU to card: FF 86 00 00 05 01 00 01 60 01
  SCardTransmit succeeded.
  Card response status word: 9000 (OK)
  Sending APDU to card: FF 86 00 00 05 01 00 01 60 01
  SCardTransmit succeeded.
  Card response status word: 9000 (OK)
  Sending APDU to card: FF D6 00 01 05 74 65 73 74 65
  SCardTransmit succeeded.
  Card response status word: 6300 (State of non-volatile memory changed.)
  </code></pre>