Physical Tamper device - VeriFone (M19755014US1) Magnetic Card Reader

Tamper detected means it's a hardware issue and it will need to be sent to Dejavoo for repair.

Yes, ground the wire going to the latch.

This just means that the cover of your device is loose

I’m happy to help further over the phone at https://www.6ya.com/expert/danny_60b7cb5b0ffb2484

"TAMPER" displays on Vx510, Vx610, or Vx670 terminal Problem/Task "TAMPER" shows on Vx510, Vx610, or Vx670 terminal Environment VeriFone Connect Any Verifone manufactured device that has the capability to contain it's own internal encryption (including Vx510, Vx610, or Vx670 terminal) Cause The message: "Tamper" will appear on the Vx510, Vx610, or Vx670 terminal if it is physically opened, damaged, or if it is jarred enough to flip and enable the internal tamper 'switch'. The reason for this is to ensure any sensitive data that passes through the terminal during a credit card transaction is not intercepted or compromised. Customer Solution/Action 1.
Contact repair facility for repair/replacement of the affected device
If you still needs help call us at (775)358-2922 ask for Randy http://freshpoint.org

To make it useable we need to remove the tamper first. Nurit OSP Loader is the the program we use to remove the TAMPER error. Replacing the internal battery and reloading a fresh NOS (nurit operating system) will remove the error. Check our website at freshpoint.org or cal us if you can at (775)358-2922 . It can be fixed, you don't need to replace it. thank you.
hope this help : - )

Bit late I'm afraid but I'm guessing you didn't use the fifth (centre) screw when you fastened the box to the wall. The centre screw is an anti-tamper device and unless you use it you'll get a tamper open error. I know because I've just been there ("it can't possibly need five screws")!

replace the flyback

took the face off and removed battery pushed the tamper button's on sensor device one on front the other on back and replaced battery. worked perfect.

Find out where the tamper fault is. This panel has tamper monitoring for external bell remote keypad zones and cover. Check all devices for loose covers ,wiring for breaks (especially if new carpets fitted) and bell box.You can check for continuety with a multimeter inside the panel you should have a short between A/T terminals and between 0v and TR if not check the wiring.
HTH

Verifone has a built in safe-guard against tampering. There are certain things that can cause the new Vx Series of terminals to display this error - from someone actually tampering with the terminal, to a physical drop or jarring of the terminal.

I hate to be the bearer of bad news, but the ONLY way for a terminal to be unlocked when displaying "Tamper" is to send it into an authorized service center. I have many of these devices in the field for customers and have dealt with this issue a few times - unfortunately, that's the only way Verifone set it up for this error to be resolved.

Sorry for the bad news, but hope it helped!