PM3 Commands Reference (Iceman Firmware):

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Current command:
lf t55xx protect --help


This command sets the pwd bit on T5577.
WARNING this locks the tag!

usage:
    lf t55xx protect [-ho] [-p <hex>] -n <hex> [--r0] [--r1] [--r2] [--r3]

options:
    -h, --help                     This help
    -o, --override                 override safety check
    -p, --pwd <hex>                password (4 hex bytes)
    -n, --new <hex>                new password (4 hex bytes)
    --r0                           downlink - fixed bit length (detected def)
    --r1                           downlink - long leading reference
    --r2                           downlink - leading zero
    --r3                           downlink - 1 of 4 coding reference

examples/notes:
    lf t55xx protect -n 01020304                   -> sets new pwd 01020304
    lf t55xx protect -p 11223344 -n 00000000       -> use pwd 11223344, sets new pwd 00000000