RFID Card with UID Rewritable

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I have been unsuccessful in writing the UID on this card as advertised, using the nfc-mfsetuid program from libnfc. (this program uses a special "unlock" command, the first step of which is transceiving 7-bits of value 0x40; the card does respond to this, but then does nothing else).

I did not receive any documentation with the card, so I am not sure if a different procedure is needed, or if the card is defective. Please advise.

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