Hello @Jdor ,
We are just IC supplier, not card maker, so for card issues , please contact the card manufacturer directly. For documentation regarding Mifare Classic IC itself ,you may refer to https://www.nxp.com/products/rfid-nfc/mifare-hf/mifare-classic/mifare-classic-ev1-1k-4k:MF1S50YYX_V1 for details.
Have a great day,
Kan
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