PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
hf 14b ndefread --help

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Print NFC Data Exchange Format (NDEF)

usage:
    hf 14b ndefread [-hv] [-f <fn>]

options:
    -h, --help                     This help
    -f, --file <fn>                Save raw NDEF to file
    -v, --verbose                  Verbose output

examples/notes:
    hf 14b ndefread
    hf 14b ndefread -f myfilename        -> save raw NDEF to file