Unfortunately, Adyen support cannot provide passwords for terminals which say "tamper" or "tampered" on the screen.
When a terminal says it has been tampered, it indicates that some damage has happened to the hardware or software of the terminal. This damage makes it so that we cannot guarantee secure processing of payments on the terminal due to PCI-DSS regulation.
You should proceed to the Customer Area either to make a replacement request, or order a new terminal. If the terminal arrived to you in a Tampered condition, please reach out to Adyen Support.
More information about Tamper Mode can be found in our documentation: https://docs.adyen.com/point-of-sale/pos-troubleshooting/terminal-turns-on/tampered