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выкладывайте скетч. которым пробовали, проблемы конкретно описывайте.

Пробовал с примера в библиотеки MFRC522:

/*
 * MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
 * The library file MFRC522.h has a wealth of useful info. Please read it.
 * The functions are documented in MFRC522.cpp.
 *
 * Based on code Dr.Leong   ( WWW.B2CQSHOP.COM )
 * Created by Miguel Balboa (circuitito.com), Jan, 2012.
 * Rewritten by Søren Thing Andersen (access.thing.dk), fall of 2013 (Translation to English, refactored, comments, anti collision, cascade levels.)
 * Extended by Tom Clement with functionality to write to sector 0 of UID changeable Mifare cards.
 * 
 * Released into the public domain.
 *
 * This sample shows how to set the UID on a UID changeable MIFARE card.
 * 
 ----------------------------------------------------------------------------- empty_skull 
 
 - Aggiunti pin per arduino Mega
 - Scritto semplice codice per la scrittura e lettura 
 
 - add pin configuration for arduino mega
 - write simple read/write Code for new entry user
 
 http://mac86project.altervista.org/
 
 ----------------------------------------------------------------------------- Nicola Coppola
 * Typical pin layout used:
 * -----------------------------------------------------------------------------------------
 *             MFRC522      Arduino       Arduino   Arduino    Arduino          Arduino
 *             Reader/PCD   Uno           Mega      Nano v3    Leonardo/Micro   Pro Micro
 * Signal      Pin          Pin           Pin       Pin        Pin              Pin
 * -----------------------------------------------------------------------------------------
 * RST/Reset   RST          9             5         D9         RESET/ICSP-5     RST
 * SPI SS      SDA(SS)      10            53        D10        10               10
 * SPI MOSI    MOSI         11 / ICSP-4   51        D11        ICSP-4           16
 * SPI MISO    MISO         12 / ICSP-1   50        D12        ICSP-1           14
 * SPI SCK     SCK          13 / ICSP-3   52        D13        ICSP-3           15
 *
 * The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com. 
 */

#include <SPI.h>
#include <MFRC522.h>

/* Set your new UID here! */
#define NEW_UID {0xDE, 0xAD, 0xBE, 0xEF}
#define SS_PIN 10
#define RST_PIN 9

MFRC522 mfrc522(SS_PIN, RST_PIN);        // Create MFRC522 instance.
MFRC522::MIFARE_Key key;

void setup() {
        Serial.begin(9600);        // Initialize serial communications with the PC
        while (!Serial);           // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
        SPI.begin();               // Init SPI bus
        mfrc522.PCD_Init();        // Init MFRC522 card
        Serial.println(F("Warning: this example overwrites the UID of your UID changeable card, use with care!"));
        
        // Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
        for (byte i = 0; i < 6; i++) {
                key.keyByte[i] = 0xFF;
        }
}

// Setting the UID can be as simple as this:
//void loop() {
//    byte newUid[] = NEW_UID;
//    if ( mfrc522.MIFARE_SetUid(newUid, (byte)4, true) ) {
//      Serial.println("Wrote new UID to card.");
//    }
//    delay(1000);
//}

// But of course this is a more proper approach
void loop() {
  
        // Look for new cards, and select one if present
        if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
            delay(50);
            return;
        }
        
        // Now a card is selected. The UID and SAK is in mfrc522.uid.
        
        // Dump UID
        Serial.print(F("Card UID:"));
        for (byte i = 0; i < mfrc522.uid.size; i++) {
                Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
                Serial.print(mfrc522.uid.uidByte[i], HEX);
        } 
        Serial.println();

        // Dump PICC type
//        byte piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
//        Serial.print(F("PICC type: "));
//        Serial.print(mfrc522.PICC_GetTypeName(piccType));
//        Serial.print(F(" (SAK "));
//        Serial.print(mfrc522.uid.sak);
//        Serial.print(")\r\n");
//        if (        piccType != MFRC522::PICC_TYPE_MIFARE_MINI 
//                &&        piccType != MFRC522::PICC_TYPE_MIFARE_1K
//                &&        piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
//                Serial.println(F("This sample only works with MIFARE Classic cards."));
//                return;
//        }
        
        // Set new UID
        byte newUid[] = NEW_UID;
        if ( mfrc522.MIFARE_SetUid(newUid, (byte)4, true) ) {
            Serial.println(F("Wrote new UID to card."));
        }
        
        // Halt PICC and re-select it so DumpToSerial doesn't get confused
        mfrc522.PICC_HaltA();
        if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
                return;
        }
        
        // Dump the new memory contents
        Serial.println(F("New UID and contents:"));
        mfrc522.PICC_DumpToSerial(&(mfrc522.uid));
        
        delay(2000);
}

повторяю - проблему описывайте конкретно.

Что не работает, или работает не так?

Загрузил скетч в ардуино который указал на форуме.Не изменилось UID код брелка   

Послушайте, уважаемый! Кому это надо - форуму или вам? Почему из вас надо все клещами вытаскивать? Давайте просыпайтесь. Будете дальше тупить - решайте тогда проблемы сами.

Какие сообщения выводит скетч? Предупреждение о перезаписи есть? Старый UID карты читает? Ошибки какие-нибудь есть?

Никаких ошибок нету. Показывает старый UID код не записывает новый 

У меня походу карты не прошиваются UID коды