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#1 2014-10-22 22:18:42

abshak
Member
Registered: 2014-10-22
Posts: 4

Restore Sector 4 with corrupt memory

The Access control is wrong in sector 4 and I know Key A & B but cant read or write to the card in this sector.
Since the Access control is wrong in C3 the card thinks that the memory is corrupt and doesn´t accept reading or writing.
Does anyone know how to restore this Sector to original so the cards can be used?

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#2 2014-10-22 23:08:08

iceman
Administrator
Registered: 2013-04-25
Posts: 9,497
Website

Re: Restore Sector 4 with corrupt memory

copy the data to another tag?

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#3 2014-10-23 07:16:48

abshak
Member
Registered: 2014-10-22
Posts: 4

Re: Restore Sector 4 with corrupt memory

Can't do since I have 1 000 tags that need to be fixed.... smile

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#4 2014-10-24 07:18:29

piwi
Contributor
Registered: 2013-06-04
Posts: 704

Re: Restore Sector 4 with corrupt memory

Unfortunately, the Mifare spec sheet doesn't have good news for you:

Remark: With each memory access the internal logic verifies the format of the access
conditions. If it detects a format violation the whole sector is irreversible blocked.

IMHO "irreversible" excludes "restore", so you have to follow iceman's advise and replace the cards.

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