PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
hf mfu keygen --help

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Set the DES/3DES/AES key on MIFARE Ultralight-C tag.

usage:
    hf mfu keygen [-hr] [-u <hex>] [-b <dec>]

options:
    -h, --help                     This help
    -u, --uid <hex>                <4|7> hex byte UID
    -r                             Read UID from tag
    -b, --blk <dec>                Block number

examples/notes:
    hf mfu keygen -r
    hf mfu keygen --uid 11223344556677