mifare sector read only

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mifare sector read only

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lorenzo_poliba
Contributor I

Hi,I am using MIFARE CLASSIC EV1 for my vending machines but I can't write to sector 3 because it is read only. I have already made sure that the keys are correct.

VBQKT.jpghow can I write to it? Thanks.

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Jonathan_Iglesias
NXP TechSupport
NXP TechSupport

Hi  ,

unfortunately if you set the sector trailer to this,  there is no way to modify it, since you set the Key A or B can only be used to read, please be careful with this and  this is very strange  because when a key is being used  when you read the trailer it should return 0s.

and I see the card is answering with the key values, can you share more information of where you got the cards and  things like that ? please send me a direct message.

Have a great day !

BR

Jonathan

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