Possessing a is not illegal in 99% of jurisdictions. Using it on a card you do not own is illegal.
If the card is not using default keys (e.g., FF FF FF FF FF FF ), you must recover the keys. mifare classic card recovery tool
Unlocking the Past: A Guide to MIFARE Classic Card Recovery Tools Possessing a is not illegal in 99% of jurisdictions
: This resets a tag to its delivery state (typically all data blocks to 00 and trailer blocks to default keys) . Advanced Recovery Tools MIFARE Classic Tool (MCT) - GitHub mifare classic card recovery tool
Possessing a is not illegal in 99% of jurisdictions. Using it on a card you do not own is illegal.
If the card is not using default keys (e.g., FF FF FF FF FF FF ), you must recover the keys.
Unlocking the Past: A Guide to MIFARE Classic Card Recovery Tools
: This resets a tag to its delivery state (typically all data blocks to 00 and trailer blocks to default keys) . Advanced Recovery Tools MIFARE Classic Tool (MCT) - GitHub