I wrote in block 7 using serial monitor
FF FF FF 11 11 11 Now I am unable to access it. Please help
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Possible duplicate of [Can I recover a MIFARE Classic card?](https://stackoverflow.com/questions/45745936/can-i-recover-a-mifare-classic-card) – Michael Roland Feb 22 '19 at 18:34
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Also see [Locking mechanism of Mifare Classic 1K](https://stackoverflow.com/q/27885861/2425802) – Michael Roland Feb 22 '19 at 18:36