Break Chip-And PIN Security

[lightdao]

Three plug the way, this should be a POS downgrade transaction practice? Now that my region (China) has fully upgraded the POS and ATM, all previous mixed cards (101 and 201) can no longer use 101 deals and can only use 201 deals. So I have a lot of 201 on the high balance dump can not use. Can only wait for 201 read and write technology can be used after maturity