tried swiping but the card asked for a pin. What might be the cause?

Trinity123

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Last Friday I wrote a card and tested it at a self-service cigarette vending machine and the sale went through and on Wednesday this week I attempting swiping a few products but the speed-point (pos) still asked for a pin. I have tampered with the chip so the speed-point resorted for emv fallback and I swiped. If there is anyone who knows a trick arround this please inform me and the speed-point was a verifone, so there are different types of tricks for different pos machines please inform me.
Thanks