PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
lf em 4x70 writekey --help

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Write new 96-bit key to tag

usage:
    lf em 4x70 writekey [-h] [--par] -k <hex>

options:
    -h, --help                     This help
    --par                          Add parity bit when sending commands
    -k, --key <hex>                Key as 12 hex bytes

examples/notes:
    lf em 4x70 writekey -k F32AA98CF5BE4ADFA6D3480B   (pm3 test key)
    lf em 4x70 writekey -k A090A0A02080000000000000   (research paper key)