The 'Irruption' alert means the terminal can no longer be used to accept transactions. Reason being, within the innards of the card device, sits an anti-tamper proof device. If the card terminal feels it is being tampered with or if the terminal suffers a hard impact, the anti-tamper proof device will trigger and shut the terminal down.
To replace, or troubleshoot, your reader please contact Hardware POS Portal support.
Proceed to manually process your customer's transactions; here are a few suggested articles if you are unsure how: