PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
hf mfu ndefread --help

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Prints NFC Data Exchange Format (NDEF)

usage:
    hf mfu ndefread [-hlv] [-k Replace default key for NDEF] [-f <fn>]

options:
    -h, --help                     This help
    -l                             Swap entered key's endianness
    -f, --file <fn>                Save raw NDEF to file
    -v, --verbose                  Verbose output

examples/notes:
    hf mfu ndefread                -> shows NDEF data
    hf mfu ndefread -k ffffffff    -> shows NDEF data with key
    hf mfu ndefread -f myfilename      -> save raw NDEF to file