PM3 Commands Reference (Iceman Firmware):

Main Help

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Current command:
hf mfp ndefformat --help

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format MIFARE Plus Tag as a NFC tag with Data Exchange Format (NDEF)
If no  given, UID will be used as filename.
It will try default keys and MAD keys to detect if tag is already formatted in order to write.

If not, it will try finding a key file based on your UID.  ie, if you ran autopwn before

usage:
    hf mfp ndefformat [-h] [-k <fn>]

options:
    -h, --help                     This help
    -k, --keys <fn>                filename of keys

examples/notes:
    hf mfp ndefformat
    hf mfp ndefformat --keys hf-mf-01020304-key.bin       ->  with keys from specified file