PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command: lf em 4x05 demod --help

Try to find EM 4x05 preamble, if found decode / descramble data

usage:
    lf em 4x05 demod [-h]

options:
    -h, --help                     This help

examples/notes:
    lf em 4x05 demod