>I don’t know EXACTLY what it is on the mag stripe that tells the terminal to use EMV mode, if anyone knows I’d love to hear it. Its in the "service code" fiel

>I don’t know EXACTLY what it is on the mag stripe that tells the terminal to use EMV mode, if anyone knows I’d love to hear it. Its in the "service code" field: https://en.wikipedia.org/wiki/Magnetic_stripe_card#Financial_cards https://en.wikipedia.org/wiki/Magnetic_stripe_card#Financial... I think if the first digit is a '2' instead of a '1', that tells the reader to force a chip-only transaction. Or in other words, if you can write the mag data to a blank card, you can set that byte to what ever you want and have a field day. Unless there is some more validation at the bank level? Haven't tried personally.