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  • Re: Reply To: DESFire EV1 Reset to factory default

    12. May 2017 at 14:26     in reply to: DESFire EV1 Reset to factory default

    SheldonM
    Hi Support,

    The main reason I'm trying to do this is to have 4000 cards back in default factory state that have been personalized mistakenly with the wrong app and keys.

    They were meant to be used on an older system that is different to what we have now as I don't have the capacity to develop a legacy app that would be compatible with the other system. The older system also doesn't have all the required source available so I don't even know where to start.

    But having the cards back in factory default would solve the immediate issue for me.

    Thanks for all your time and help so far.

    Regards,
    Sheldon
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    Re: Reply To: DESFire EV1 Reset to factory default

    10. May 2017 at 10:43     in reply to: DESFire EV1 Reset to factory default

    SheldonM
    Thank you. I noticed that. The formatting works as I can verify that the cards contents is empty.

    Can the card encryption type be set back to DES from AES?

    The datasheet doesn't appear to be very clear on this.

    I found DES to AES, DES to DES, AES to AES but nothing on AES to DES.

    Or if has has been changed to AES will it be no longer possible to revert back to DES when trying to restore back to factory state?

    Thank you for your time and effort.
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