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

[hassoya]

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 ?

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

[uRock]

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.