Reset MiFare classic 1K cards to initial blank state

[Neil Thyer]

Hi,

Sorry for the newbie question.
We purchased a lot of branded MiFare Classic 1k cards for a hotel lock system but now are upgrading the locks. Is there a way to reset (erase) the a cards for reuse.

Cards are all 14443 / Type A, Mifare Classic 1k.
The issue is that sector 14 KeyA / KeyB is a derived key from the Card uid, so differs between cards. The new locks also use sector 14, but a different key derivation method.
So is there a generic app which can be used to reset a card to facory defaults FFFFFFFFFFFF Key A/B pairs.

We know that we can use tools to figure out the keys 1 at a time and then unlock and re-image.
But is there another simple way to do this as a generic - clear all and reset?

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