Dear Ismael Cortés,
Hope you are doing great, as you may know the information regarding Mifare DESFire is secured under NDA ( Non Disclosure Agreement) this means that all the information, tools and support should be delivered using secured communication channels and only with customers with active NDA. also the RC522 is no longer recommended for new designs the recommendation here would be that you use the MFRC630 or MFRC630. we have an NFC reader library available for this last two products, but this is meant to work with some of our MCU. please check the library also the two readers above.
Have a great day !
BR
Jonathan
