I am trying to clone/write copies of an NFC card. I am using an ACR122U-A9 .But I really need to be able to format cards to NDEF, and to read and write NDEF data on a MIFARE Classic 1K card. . For an example of how to accesws MIFARE Classic cards see. the nfc-mfclassic util that's included in the libnfc package (see nfc-mfclassic.c), the micmd .