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Thread: Can not write on NFC Tag with libnfc 1.7.1. Command nfc-mfclassic does not work

  1. #1
    Join Date
    Oct 2019
    Beans
    2

    Can not write on NFC Tag with libnfc 1.7.1. Command nfc-mfclassic does not work

    I used the tools mfoc and mfcuk to clone my fitness access-card. I tried to write the informations into the dump card with the command nfc-mfclassic. But every time I get this warning:

    Warning: Unlock command [1/2]: failed / not acknowledged. Writing 64 blocks |Failure to write to data block 4

    I changed the original cards und tried to write on other dump cards but still the same message.

    I looked into the source code but could not figure out what to do. Does anyone had the same message ?

    Code:
    hassoya@hassoya-iMac:~/mfoc/src$ nfc-mfclassic W a file.dmp dummy.dmp
    NFC reader: ACS / ACR122U PICC Interface opened
    Found MIFARE Classic card:
    ISO/IEC 14443A (106 kbps) target:
        ATQA (SENS_RES): 00  04  
           UID (NFCID1): 0a  5e  dd  c4  
          SAK (SEL_RES): 08  
    Guessing size: seems to be a 1024-byte card
    Sent bits:     50  00  57  cd  
    Sent bits:     40 (7 bits)
    Warning: Unlock command [1/2]: failed / not acknowledged. Writing 64 blocks |Failure to write to data block 4

    I am using Ubuntu 18.04 and the reader ACS ACR122U

  2. #2
    Join Date
    Feb 2010
    Location
    South of the Maple Trees
    Beans
    Hidden!
    Distro
    Xubuntu 18.04 Bionic Beaver

    Re: Can not write on NFC Tag with libnfc 1.7.1. Command nfc-mfclassic does not work

    Hello and welcome to the forums.

    We cannot help you create illegal reproductions of your gym card. Please take the time to read our Forum Rules.

    Thread Closed.

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