You can try to clear the terminal's memory through the service menu as detailed by МСТ Компани .
Verifone terminals contain a dedicated secure microcontroller. If a firmware update was interrupted (power outage during download), the secure element can enter a “permanent error” state. A simple reboot won’t fix this. You need to: security alarm tampering detected please reboot verifone
For terminals older than 2 years, have a technician check the internal tamper battery voltage during annual PCI audits. Replace proactively. You can try to clear the terminal's memory
If you suspect a real attack, do NOT reboot. Instead: do NOT reboot. Instead: