I use this Code to read out the Card: myarduino/RC522DumpMifare.ino at master · rena2019/myarduino · GitHub
there is a MFRC522_Write() implemented but how do i use this?
I test this:
uchar MyData[16] = { 0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xAA,0xBB,0xCC,0xDD,0xEE };
status = MFRC522_Auth(PICC_AUTHENT1A, block, defaultKeyA, serNum);
status = MFRC522_Write(15,MyData);