Hi,
I would recommend to contact the tag manufacturer in order to have the detailed datasheet of this product in particular to have the list of supported optional commands (such as the optional Lock block command) and the list of proprietary commands/features (such as read password protection). Then, proprietary commands can be sent from the reader to the tag thanks to the rfalNfcvPollerTransceiveReq() API (see various example on how to use it in rfal_st25xv.c).
Just for my curiosity, can you send me the UID of such a tag?
Rgds
BT
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