BioStar supports four types of cards: EM, HID, Mifare CSN and Mifare Template cards.
However, you can delete EM, HID and Mifare CSN cards only. It is impossible to delete a Mifare Template card since all the necessary information is not stored in the database, but in the card itself.
How to delete an EM, HID, and Mifare CSN card registered to the user
1. Go to the User page, choose a user from whom you want to delete a card in the User pane and click the Card tab.
2. Click Card Management, enter 0 in the Card ID field and click OK.
3. Click Apply to complete the card deletion process.