Change default factory Key

[clooner80]

Hi
Im trying to change default key of a rfid tag from this
FFFFFFFFFFFF
To this
111111111111
using Arduino and Mfrc522 module.
The problem is i get this error in serial monitor:
-> Authentication failed: Timeout in communication.
What should i do to be able to change this factory key? Dumpinfo example from the Mfrc522 library works perfectly, so it's not connections or wiring problem.

Here is my code:
`#include <SPI.h>
#include <MFRC522.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

// Define the sector trailer block where the access bits are stored
#define TRAILER_BLOCK 3

void setup() {
Serial.begin(9600); // Initialize serial communications with the PC
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
Serial.println(F("Change access bits and authentication key for a MIFARE PICC "));
}

void loop() {
// Prepare the current and new keys
MFRC522::MIFARE_Key currentKey;
MFRC522::MIFARE_Key newKey;
for (byte i = 0; i < 6; i++) {
currentKey.keyByte[i] = 0xFF; // Default key
newKey.keyByte[i] = 0x11; // New key (change this to your desired key)
}

// Reset the loop if no new card present on the sensor/reader
if (!mfrc522.PICC_IsNewCardPresent()) {
return;
}

// Select one of the cards
if (!mfrc522.PICC_ReadCardSerial()) {
return;
}

// Authenticate with the current key
byte block = 1; // Example block to authenticate
MFRC522::StatusCode status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &currentKey, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK) {
Serial.print(F("Authentication failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}

// Change authentication key
status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &newKey, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK) {
Serial.print(F("Key change failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}

// Inform about successful key change
Serial.println(F("Access bits and authentication key changed successfully"));

mfrc522.PICC_HaltA(); // Halt PICC
mfrc522.PCD_StopCrypto1(); // Stop encryption on PCD
}`