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Hi Csaba,
This is one of the security features of the MIFARE Classic. Writing zero bytes to the sector trailer invalidate the sector. There is no valid combination of access condition bits with these values.
The TapLinx team
This is one of the security features of the MIFARE Classic. Writing zero bytes to the sector trailer invalidate the sector. There is no valid combination of access condition bits with these values.
The TapLinx team
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