title: Can I recover a MIFARE Classic card?
body: <p>My problem is that I used the "read and write" example on the Arduino to re-write an RFID card (MIFARE Classic 1K) block by block. I started writing at block 4. At block 7 it stopped and now I can't read any sector. I wrote zeros to each block.</p>
  
  <p>The <code>DumpToSerial</code> function just prints for every sector</p>
  
  <blockquote>
    <p>PCD_Authenticate() failed: Timeout in communication.</p>
  </blockquote>
  
  <p>It can still read the UID, the SAK, and the PICC type.</p>
  
  <p>Did I destroy the card or can I recover it? </p>
  
  <p>Some more info:</p>
  
  <ul>
  <li>Card: MIFARE Classic 1K</li>
  <li>Arduino Mega2560 from Elegoo</li>
  <li>RC522 from the starter-kit</li>
  </ul>