PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
hf gallagher decode --help

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Decode Gallagher credential block
Credential block can be specified with or without the bitwise inverse.

usage:
    hf gallagher decode [-h] --data <hex>

options:
    -h, --help                     This help
    --data <hex>                   Credential block (8 or 16 bytes)

examples/notes:
    hf gallagher decode --data A3B4B0C151B0A31B