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What does it mean that the bank ATM does not accept protocol cards?

It has nothing to do with this protocol card. It should be that the card has not been used for a long time, or the card has been demagnetized.

If your bank card is not used for a long time, it will be regarded as sleep card or automatically cancelled by the bank. Please bring your ID card to the bank for replacement.

Another situation is that the card is demagnetized. The magnetic stripe card is too close to the magnetic buckle in the wallet or wallet, and even touching the magnetic buckle may cause the card to degauss.