6400Execution error — memory unchanged

What does APDU response 6400 mean?

Execution error; the state of non-volatile memory is unchanged.

In an EMV transaction

• A card-internal failure. The terminal treats it as a card error and terminates the transaction; retrying rarely helps.

Decode any value

Paste any SW1 SW2 status word — including proprietary and card-OS specific values — to look it up in the full list.

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