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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: 9,538
- 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.... 
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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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